People stand near a sculpture 'Sad Angel' in St. Petersburg, Russia, Thursday, March 4, 2021, during the opening of a memorial for St. Petersburg's medical workers who died from coronavirus during their work. Hundreds of medical workers in Russia have died in the pandemic. The sculpture of angel was created by sculptor Roman Shustrov. (AP Photo/Dmitri Lovetsky)

People stand near a sculpture 'Sad Angel' in St. Petersburg, Russia, Thursday, March 4, 2021, during the opening of a memorial for St. Petersburg's medical workers who died from coronavirus during their work. Hundreds of medical workers in Russia have died in the pandemic. The sculpture of angel was created by sculptor Roman Shustrov. (AP Photo/Dmitri Lovetsky)

People stand near a sculpture 'Sad Angel' in St. Petersburg, Russia, Thursday, March 4, 2021, during the opening of a memorial for St. Petersburg's medical workers who died from coronavirus during their work. Hundreds of medical workers in Russia have died in the pandemic. The sculpture of angel was created by sculptor Roman Shustrov. (AP Photo/Dmitri Lovetsky)

People walk along the frozen Fontanka River past the inscription 'Navalny' trampled by supporters of opposition leader Alexei Navalny in snow on the ice, in St. Petersburg, Russia, Saturday, Feb. 13, 2021. When the team of jailed Russia opposition leader Alexei Navalny announced a protest in a new format, urging people to come out to their residential courtyards on Sunday and shine their cellphone flashlights, many responded with jokes and skepticism. (AP Photo/Dmitri Lovetsky)

A man skis along the frozen Fontanka River past the inscription 'Navalny' trampled by supporters of opposition leader Alexei Navalny in snow on the ice, in St. Petersburg, Russia, Saturday, Feb. 13, 2021. When the team of jailed Russia opposition leader Alexei Navalny announced a protest in a new format, urging people to come out to their residential courtyards on Sunday and shine their cellphone flashlights, many responded with jokes and skepticism. (AP Photo/Dmitri Lovetsky)

The muzzel flash seen as the cannon makes its traditional midday shot from the Saint Peter and Paul Fortress in St. Petersburg, Russia, Friday, Feb. 12, 2021. (AP Photo/Dmitri Lovetsky)

A man warms up prior to swimming in an ice hole in the Neva River St. Petersburg, Russia, Wednesday, Feb. 10, 2021. The temperature in St. Petersburg is -15C ( 5 ?oF). (AP Photo/Dmitri Lovetsky)

A man bathes in an ice hole in the Neva River St. Petersburg, Russia, Wednesday, Feb. 10, 2021. The temperature in St. Petersburg is -15C ( 5 ?oF). (AP Photo/Dmitri Lovetsky), APTOPIX

A man fishes through an ice hole in the fog in the Finnish Gulf in St. Petersburg, Russia, Tuesday, Feb. 9, 2021, with the sailing ship Poltava in the background. (AP Photo/Dmitri Lovetsky)

People walk on ice of the Finnish Gulf in the fog in St. Petersburg, Russia, Tuesday, Feb. 9, 2021. (AP Photo/Dmitri Lovetsky)

People gather for a flashmob in support of Russian President Vladimir Putin at a Vladimir Lenin in St. Petersburg, Russia, Monday, Feb. 8, 2021. Kremlin-backed media reported that a grassroots flashmob titled "Putin is our president" started sweeping the country. State news channel Rossiya 24 aired videos from different cities of people dancing to patriotic songs and waving Russian flags, describing them as a genuine expression of support for Putin. (AP Photo)

Russian riot policemen patrol downtown Saint Peresburg on February 6, 2021 to prevent possible protests in support of jailed opposition leader Alexei Navalny. - Navalny, 44, was detained on January 17 upon returning to Moscow after five months in Germany recovering from a near-fatal poisoning with a nerve agent and later jailed for 30 days while awaiting trial for violating a suspended sentence he was handed in 2014. (Photo by Olga MALTSEVA / AFP)

Servicemen of the Russian National Guard (Rosgvardia) patrol downtown Saint Peresburg on February 6, 2021 to prevent possible protests in support of jailed opposition leader Alexei Navalny. - Navalny, 44, was detained on January 17 upon returning to Moscow after five months in Germany recovering from a near-fatal poisoning with a nerve agent and later jailed for 30 days while awaiting trial for violating a suspended sentence he was handed in 2014. (Photo by Olga MALTSEVA / AFP)

A Russian Rosguardia (National Guard) soldier stands at a central avenue a day before Sunday's protest in St. Petersburg, Russia, Saturday, Jan. 30, 2021. As part of a multipronged effort by the authorities to discourage Russians from attending Sunday's demonstrations, the Prosecutor General's office ordered the state communications watchdog, Roskomnadzor, to block the calls for joining the protests on the internet. The Prosecutor General's office and the Interior Ministry also issued stern warnings to the public not to join the protests, saying participants could face criminal charges of taking part in mass riots if the rallies turn violent. (AP Photo/Dmitri Lovetsky)

A Russian Rosguardia (National Guard) soldier stands at a central avenue in front of a restaurant promoter, a day before Sunday's protest in St. Petersburg, Russia, Saturday, Jan. 30, 2021. As part of a multipronged effort by the authorities to discourage Russians from attending Sunday's demonstrations, the Prosecutor General's office ordered the state communications watchdog, Roskomnadzor, to block the calls for joining the protests on the internet. The Prosecutor General's office and the Interior Ministry also issued stern warnings to the public not to join the protests, saying participants could face criminal charges of taking part in mass riots if the rallies turn violent. (AP Photo/Dmitri Lovetsky)

A Russian Rosguardia (National Guard) soldier stands at a central avenue in front of a restaurant promoter, a day before Sunday's protest in St. Petersburg, Russia, Saturday, Jan. 30, 2021. As part of a multipronged effort by the authorities to discourage Russians from attending Sunday's demonstrations, the Prosecutor General's office ordered the state communications watchdog, Roskomnadzor, to block the calls for joining the protests on the internet. The Prosecutor General's office and the Interior Ministry also issued stern warnings to the public not to join the protests, saying participants could face criminal charges of taking part in mass riots if the rallies turn violent. (AP Photo/Dmitri Lovetsky)

People wearing face masks as a protective measure against the spread of coronavirus (COVID-19) walk around the subway amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

People wearing face masks as a protective measure against the spread of coronavirus (COVID-19) walk around the subway amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

A woman wearing a face mask as a protective measure against the spread of coronavirus (COVID-19) walks around the subway station amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

A woman wearing a face mask as a protective measure against the spread of coronavirus (COVID-19) walks around the subway station amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

People wearing face masks as a protective measure against the spread of coronavirus (COVID-19) walk around the subway amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

A woman wearing a face mask as a protective measure against the spread of coronavirus (COVID-19) walks around the subway station amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

A woman wearing a face mask as a protective measure against the spread of coronavirus (COVID-19) walks around the subway station amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

A person wearing a face mask as a protective measure against the spread of coronavirus (COVID-19) walks around the subway station amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

People wearing face masks as a protective measure against the spread of coronavirus (COVID-19) walk around the subway amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

People wearing face masks as a protective measure against the spread of coronavirus (COVID-19) walk around the subway amid coronavirus crisis. Russia has recorded at least 3633952 cases and 67220 deaths by the COVID-19 disease. (Photo by Sergei Mikhailichenko / SOPA Ima/Sipa USA)

A woman writes with her foot on a frosty barrier in Russian 'We demand freedom for Navalny' in St.Petersburg, Russia, Monday, Jan. 18, 2021. Russian opposition leader Alexei Navalny was detained at passport control at Moscow's Sheremetyevo airport after flying in Sunday evening from Berlin, where he was treated following the poisoning in August that he blames on the Kremlin. (AP Photo/Dmitri Lovetsky)

People play with a sled in a park in St. Petersburg, Russia, Saturday, Jan. 16, 2021. The temperature in St. Petersburg is -15C ( 1.4F). (AP Photo/Dmitri Lovetsky)

A man pulls a sled at sunset in a park in St. Petersburg, Russia, Saturday, Jan. 16, 2021. The temperature in St. Petersburg is -15C ( 1.4F). (AP Photo/Dmitri Lovetsky)

A cyclist warms himself up near the eternal flame at the Mars Field in St. Petersburg, Russia, Friday, Jan. 15, 2021. The temperature in St. Petersburg is -15C ( 1.4F). (AP Photo/Dmitri Lovetsky)

People warm themselves up near the eternal flame at the Mars Field in St.Petersburg, Russia, Friday, Jan. 15, 2021. The temperature in St. Petersburg is -15C ( 1.4F). (AP Photo/Dmitri Lovetsky)

A Navy sailor stands on guard during snowfall at the Aurora Cruiser in St. Petersburg, Russia, Friday, Jan. 15, 2021. The temperature in St. Petersburg is -15C ( 1.4F). (AP Photo/Dmitri Lovetsky)

A woman bathes in an ice hole in a pond in St. Petersburg, Russia, Thursday, Jan. 14, 2021. The temperature in St. Petersburg is -15C ( 5 ?oF). (AP Photo/Dmitri Lovetsky)

A man bathes in an ice hole in the Neva River in St. Petersburg, Russia, Wednesday, Jan. 13, 2021. The temperature in St. Petersburg is -15C ( 5 ?oF). (AP Photo/Dmitri Lovetsky)

Ladies skate on the ice at the frozen Gulf of Finland with a background view of Lakhta Center in St. Petersburg. Temperatures dropped to minus eleven degree Celsius in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

A man ski on the ice at the frozen Gulf of Finland in St. Petersburg. Temperatures dropped to minus sixteen degree Celsius in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

A dog is seen on the ice at the frozen Finnish Gulf with a background view of Lakhta Center in St. Petersburg. Temperatures dropped to minus eleven degree Celsius in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River during sunset in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

Women take photos on the ice at the frozen Neva River with a background view of State Hermitage museum in St. Petersburg. in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River during sunset in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River during sunset in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

A man walks over the ice at the frozen Neva River with a background view of State Hermitage museum in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

A woman take photos on the ice at the frozen Neva River in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River with a background view of Saint Isaac's Cathedral in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

A man walks over the ice at the frozen Neva River in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

A couple walks over the ice at the frozen Neva River in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River with a background view of Saint Isaac's Cathedral in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River with a background view of Saint Isaac's Cathedral in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River with a background view of Saint Isaac's Cathedral in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

A man walks over the ice at the frozen Neva River with a background view of Saint Isaac's Cathedral in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River with a background view of Saint Isaac's Cathedral in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

People walk over the ice at the frozen Neva River with a background view of Saint Isaac's Cathedral in St. Petersburg. Temperatures dropped to -16oC in the second capital of Russia. (Photo by Sergei Mikhailichenko / SOPA Images/Sipa USA)

06 January 2021, Mecklenburg-Western Pomerania, Sassnitz-Mukran: The beacon on the pier leading to the port entrance at Mukran Port on the island of Rugen flashes a green light. At Mukran Port, pipelines and material for the construction of gas pipelines through the Baltic Sea are loaded. Photo: Jens Buttner/dpa-Zentralbild/ZB

This combo of images shows at top, a few people walking along Nevsky prospect, central avenue, during New Year celebration in downtown St. Petersburg, Russia, Friday, Jan. 1, 2021, and below, a file photo of the same location packed with people on Wednesday, Jan. 1, 2020. As the world says goodbye to 2020, there will be countdowns and live performances, but no massed jubilant crowds in traditional gathering spots like the Champs Elysees in Paris and New York City's Times Square this New Year's Eve. The virus that ruined 2020 has led to cancelations of most fireworks displays and public events in favor of made-for-TV-only moments in party spots like London and Rio de Janeiro. (AP Photo/Dmitri Lovetsky)

People walk in Nevsky prospect, central avenue, during New Year celebration in downtown St. Petersburg, Russia, Friday, Jan. 1, 2021. As the world says goodbye to 2020, there will be countdowns and live performances, but no massed jubilant crowds in traditional gathering spots like the Champs Elysees in Paris and New York City's Times Square this New Year's Eve. The virus that ruined 2020 has led to cancelations of most fireworks displays and public events in favor of made-for-TV-only moments in party spots like London and Rio de Janeiro. (AP Photo/Dmitri Lovetsky)

A couple take a selfie photo at the Palace Square during New Year celebration in downtown St. Petersburg, Russia, Friday, Jan. 1, 2021. As the world says goodbye to 2020, there will be countdowns and live performances, but no massed jubilant crowds in traditional gathering spots like the Champs Elysees in Paris and New York City's Times Square this New Year's Eve. The virus that ruined 2020 has led to cancelations of most fireworks displays and public events in favor of made-for-TV-only moments in party spots like London and Rio de Janeiro. (AP Photo/Dmitri Lovetsky)

A policeman wearing a face mask to protect against coronavirus infection stands guard blocking the passage of people to reduce the number of people celebrating the New Year on the Palace Square in downtown St. Petersburg, Russia, Friday, Jan. 1, 2021. As the world says goodbye to 2020, there will be countdowns and live performances, but no massed jubilant crowds in traditional gathering spots like the Champs Elysees in Paris and New York City's Times Square this New Year's Eve. The virus that ruined 2020 has led to cancelations of most fireworks displays and public events in favor of made-for-TV-only moments in party spots like London and Rio de Janeiro. (AP Photo/Dmitri Lovetsky)

A view of Lomonosov Bridge through the Fontanka River with light decorations for the incoming New Year and Orthodox Christmas celebrations in St.Petersburg, Russia, Sunday, Dec. 27, 2020. (AP Photo/Dmitri Lovetsky)

People wearing a Ded Moroz (also known as Santa Claus, or Grandfather Frost), left, and a Snow Maiden costumes rise by a fire lift to wish the children undergoing treatment at the Almazov Children's Rehabilitation Clinic a Happy New Year and Orthodox Christmas in St.Petersburg, Russia, Saturday, Dec. 26, 2020. (AP Photo/Dmitri Lovetsky)

People wearing a Ded Moroz (also known as Santa Claus, or Grandfather Frost), left, and a Snow Maiden costumes rise by a fire lift to wish the children undergoing treatment at the Almazov Children's Rehabilitation Clinic a Happy New Year and Orthodox Christmas in St.Petersburg, Russia, Saturday, Dec. 26, 2020. (AP Photo/Dmitri Lovetsky)