Police van carrying the Russian opposition leader Alexey Navalny arrives to the Babushkinsky district court prior to the start of the trial in Moscow, Russia, Tuesday, Feb. 16, 2021. Moscow court continues the trial against Navalny on the charges of defamation. Navalny was accused of slandering a World War II veteran featured in the video promoting the constitutional reform allowing to extend President Vladimir Putin's rule. The politician slammed people in the video as "traitors" and stands trial on defamation charges. (AP Photo/Alexander Zemlianichenko)

Russian Federal Bailiffs service officers stand at the Babushkinsky district court prior to the start of the trial against Russian opposition leader Alexey Navalny in Moscow, Russia, Tuesday, Feb. 16, 2021. Moscow court continues the trial against Navalny on the charges of defamation. Navalny was accused of slandering a World War II veteran featured in the video promoting the constitutional reform allowing to extend President Vladimir Putin's rule. The politician slammed people in the video as "traitors" and stands trial on defamation charges. (AP Photo/Alexander Zemlianichenko)

Russian Federal Bailiffs service officers stand at the Babushkinsky district court prior to the start of the trial against Russian opposition leader Alexey Navalny in Moscow, Russia, Tuesday, Feb. 16, 2021. Moscow court continues the trial against Navalny on the charges of defamation. Navalny was accused of slandering a World War II veteran featured in the video promoting the constitutional reform allowing to extend President Vladimir Putin's rule. The politician slammed people in the video as "traitors" and stands trial on defamation charges. (AP Photo/Alexander Zemlianichenko)

Russian Federal Bailiffs service officers stand at the Babushkinsky district court prior to the start of the trial against Russian opposition leader Alexey Navalny in Moscow, Russia, Tuesday, Feb. 16, 2021. Moscow court continues the trial against Navalny on the charges of defamation. Navalny was accused of slandering a World War II veteran featured in the video promoting the constitutional reform allowing to extend President Vladimir Putin's rule. The politician slammed people in the video as "traitors" and stands trial on defamation charges. (AP Photo/Alexander Zemlianichenko)

Russian Federal Bailiffs service officers walk at the Babushkinsky district court prior to the start of the trial against Russian opposition leader Alexey Navalny in Moscow, Russia, Tuesday, Feb. 16, 2021. Moscow court continues the trial against Navalny on the charges of defamation. Navalny was accused of slandering a World War II veteran featured in the video promoting the constitutional reform allowing to extend President Vladimir Putin's rule. The politician slammed people in the video as "traitors" and stands trial on defamation charges. (AP Photo/Alexander Zemlianichenko)

Russian Federal Bailiffs service officers stand at the Babushkinsky district court prior to the start of a trial against Russian opposition leader Alexey Navalny in Moscow, Russia, Tuesday, Feb. 16, 2021. Moscow court continues the trial against Navalny on the charges of defamation. Navalny was accused of slandering a World War II veteran featured in the video promoting the constitutional reform allowing to extend President Vladimir Putin's rule. The politician slammed people in the video as "traitors" and stands trial on defamation charges. (AP Photo/Alexander Zemlianichenko)

Russian Federal Bailiffs service officers walk at the Babushkinsky district court prior to the start of a trial against Russian opposition leader Alexey Navalny in Moscow, Russia, Tuesday, Feb. 16, 2021. Moscow court continues the trial against Navalny on the charges of defamation. Navalny was accused of slandering a World War II veteran featured in the video promoting the constitutional reform allowing to extend President Vladimir Putin's rule. The politician slammed people in the video as "traitors" and stands trial on defamation charges. (AP Photo/Alexander Zemlianichenko)

Russian Federal Bailiffs service officers stand guard at the Babushkinsky district court prior to the start of the trial against Russian opposition leader Alexey Navalny in Moscow, Russia, Tuesday, Feb. 16, 2021. Moscow court continue the trial against Russian opposition leader Alexey Navalny on the charges of defamation. Navalny was accused of slandering a World War II veteran featured in the video promoting the constitutional reform allowing to extend President Vladimir Putin's rule. The politician slammed people in the video as "traitors" and stands trial on defamation charges. (AP Photo/Alexander Zemlianichenko)

In this photo taken from a footage provided by the Babuskinsky District Court Tuesday, Feb. 16, 2021, Russian opposition leader Alexei Navalny gestures during a hearing on his charges for defamation in the Babuskinsky District Court in Moscow, Russia. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (Babuskinsky District Court Press Service via AP)

In this photo taken from a footage provided by the Babuskinsky District Court Tuesday, Feb. 16, 2021, Russian opposition leader Alexei Navalny, center smiles as he talks with his lawyers Olga Mikhailova, left, and Vadim Kobzev during a hearing on his charges for defamation in the Babuskinsky District Court in Moscow, Russia. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (Babuskinsky District Court Press Service via AP)

In this photo taken from a footage provided by the Babuskinsky District Court Tuesday, Feb. 16, 2021, Russian opposition leader Alexei Navalny gestures during a hearing on his charges for defamation in the Babuskinsky District Court in Moscow, Russia. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (Babuskinsky District Court Press Service via AP)

In this photo taken from a footage provided by the Babuskinsky District Court Tuesday, Feb. 16, 2021, Russian opposition leader Alexei Navalny, center, enters a cage to attend a hearing on his charges for defamation in the Babuskinsky District Court in Moscow, Russia. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (Babuskinsky District Court Press Service via AP)

In this photo taken from a footage provided by the Babuskinsky District Court Tuesday, Feb. 16, 2021, Russian opposition leader Alexei Navalny writes notes as he stands in a cage during a hearing on his charges for defamation in the Babuskinsky District Court in Moscow, Russia. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (Babuskinsky District Court Press Service via AP)

In this photo taken from a footage provided by the Babuskinsky District Court Tuesday, Feb. 16, 2021, Russian opposition leader Alexei Navalny stands in a cage during a hearing on his charges for defamation in the Babuskinsky District Court in Moscow, Russia. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (Babuskinsky District Court Press Service via AP)

A Police van carrying the Russian opposition leader Alexey Navalny, escorted by police cars arrives to the Babushkinsky district court prior to the start of the trial in Moscow, Russia, early Tuesday, Feb. 16, 2021. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (AP Photo/Alexander Zemlianichenko)

A Police officer patrols an area around a court during the trial against Russian opposition leader Alexey Navalny in Moscow, Russia, on Tuesday, Feb. 16, 2021. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (AP Photo/Alexander Zemlianichenko)

Russian Federal Bailiffs service officers stand during a briefing at the Babushkinsky district court prior to the start of a trial against Russian opposition leader Alexey Navalny in Moscow, Russia, on Tuesday, Feb. 16, 2021. Navalny is accused of defaming a World War II veteran who was featured in a video last year advertising constitutional amendments that allowed an extension of President Vladimir Putin's rule. (AP Photo/Alexander Zemlianichenko)

A general view of the Babushkinsky district court before the trial of Russian opposition leader Alexei Navalny, charged with defaming a World War II veteran, in Moscow on February 16, 2021. (Photo by Kirill KUDRYAVTSEV / AFP)

Court bailiffs stand guard outside the Babushkinsky district court before the trial of Russian opposition leader Alexei Navalny, charged with defaming a World War II veteran, in Moscow on February 16, 2021. (Photo by Kirill KUDRYAVTSEV / AFP)

A law enforcement officer stands guard outside the Babushkinsky district court before the trial of Russian opposition leader Alexei Navalny, charged with defaming a World War II veteran, in Moscow on February 16, 2021. (Photo by Kirill KUDRYAVTSEV / AFP)

A police officer patrols outside the Babushkinsky district court before the trial of Russian opposition leader Alexei Navalny, charged with defaming a World War II veteran, in Moscow on February 16, 2021. (Photo by Kirill KUDRYAVTSEV / AFP)

This screen grab from a handout footage provided by the Babushkinsky district court on February 16, 2021, shows Russian opposition leader Alexei Navalny, charged with defaming a World War II veteran, gesturing from inside a glass cell during a court hearing in Moscow. (Photo by Handout / Moscow's Babushkinsky district court press service / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / Moscow's Babushkinsky district court press service / handout " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

This screen grab from a handout footage provided by the Babushkinsky district court on February 16, 2021, shows Russian opposition leader Alexei Navalny, charged with defaming a World War II veteran, looking from inside a glass cell during a court hearing in Moscow. (Photo by Handout / Moscow's Babushkinsky district court press service / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / Moscow's Babushkinsky district court press service / handout " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

This screen grab from a handout footage provided by the Babushkinsky district court on February 16, 2021, shows Russian opposition leader Alexei Navalny, charged with defaming a World War II veteran, looking from inside a glass cell during a court hearing in Moscow. (Photo by Handout / Moscow's Babushkinsky district court press service / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / Moscow's Babushkinsky district court press service / handout " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

This screen grab from a handout footage provided by the Babushkinsky district court on February 16, 2021, shows Russian opposition leader Alexei Navalny, charged with defaming a World War II veteran, looking from inside a glass cell during a court hearing in Moscow. (Photo by Handout / Moscow's Babushkinsky district court press service / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / Moscow's Babushkinsky district court press service / handout " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

MOSCOW, RUSSIA - FEBRUARY 16: (----EDITORIAL USE ONLY ????" MANDATORY CREDIT - "MOSCOW COURT PRESS SERVICE / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Russian opposition Alexei Navalny appears in court for a hearing in the criminal case against him for defaming a World War II veteran in Moscow, Russia on February 16, 2021. Moscow Court Press Service/Handout / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - FEBRUARY 16: (----EDITORIAL USE ONLY ????" MANDATORY CREDIT - "MOSCOW COURT PRESS SERVICE / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Russian opposition Alexei Navalny appears in court for a hearing in the criminal case against him for defaming a World War II veteran in Moscow, Russia on February 16, 2021. Moscow Court Press Service/Handout / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - FEBRUARY 16: (----EDITORIAL USE ONLY ????" MANDATORY CREDIT - "MOSCOW COURT PRESS SERVICE / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Russian opposition Alexei Navalny appears in court for a hearing in the criminal case against him for defaming a World War II veteran in Moscow, Russia on February 16, 2021. Moscow Court Press Service/Handout / Anadolu Agency/ABACAPRESS.COM

MOSCOW, RUSSIA - FEBRUARY 16: (----EDITORIAL USE ONLY ????" MANDATORY CREDIT - "MOSCOW COURT PRESS SERVICE / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Russian opposition Alexei Navalny appears in court for a hearing in the criminal case against him for defaming a World War II veteran in Moscow, Russia on February 16, 2021. Moscow Court Press Service/Handout / Anadolu Agency/ABACAPRESS.COM