Yulia, wife of Russian opposition leader Alexei Navalny, cente, sits on a chair upon arrival at Sheremetyevo airport in Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case. (AP Photo/Alexander Zemlianichenko)

Yulia, wife of Russian opposition leader Alexei Navalny, is photographed upon arrival at Sheremetyevo airport in Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case. (AP Photo/Pavel Golovkin)

In this photo taken from video, Alexei Navalny kisses his wife Yulia as he is detained by police at the passport control after arriving at Sheremetyevo airport, outside Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. (AP)

Alexei Navalny and his wife Yuliastand in line at the passport control after arriving at Sheremetyevo airport, outside Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. (AP Photo/Mstyslav Chernov)

APTOPIX Alexei Navalny and his wife Yuliastand in line at the passport control after arriving at Sheremetyevo airport, outside Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. (AP Photo/Mstyslav Chernov)

Yulia, wife of Russian opposition leader Alexei Navalny, is photographed upon arrival at Sheremetyevo airport in Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case. (AP Photo/Pavel Golovkin)

Alexei Navalny kisses his wife Yulia as he is detained by police at the passport control after arriving at Sheremetyevo, airport outside Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. (AP Photo/Mstyslav Chernov)

In this grab taken from video, Alexei Navalny and his wife Yulia stand at the passport control before Navalny was detained by police after arriving at Sheremetyevo airport, outside Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. (AP)

Opposition leader Alexei Navalny's wife Yulia is surrounded by people as she leaves Moscow's Sheremetyevo airport in Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case. (AP Photo/Pavel Golovkin)

Yulia, wife of Russian opposition leader Alexei Navalny, is photographed at Sheremetyevo airport in Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case.(AP Photo/Alexander Zemlianichenko)

Yulia, wife of Russian opposition leader Alexei Navalny, is photographed after arriving at Sheremetyevo airport in Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case. (AP Photo/Alexander Zemlianichenko)

Yulia, wife of Russian opposition leader Alexei Navalny, is photographed after arriving at Sheremetyevo airport in Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case.(AP Photo/Alexander Zemlianichenko)

Yulia, wife of Russian opposition leader Alexei Navalny, speaks to the media after arriving at Sheremetyevo airport outside Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case. (AP Photo/Alexander Zemlianichenko)

Yulia, wife of Russian opposition leader Alexei Navalny, speaks to the media after arriving at Sheremetyevo airport outside Moscow, Russia, Sunday, Jan. 17, 2021. Russia's prison service says opposition leader Alexei Navalny has been detained at a Moscow airport after returning from Germany. The prison service said he was detained Sunday for multiple violations of parole and terms of a suspended prison sentence and would be held in custody until a court makes a decision in his case. (AP Photo/Alexander Zemlianichenko)

TOPSHOT Russian opposition leader Alexei Navalny and his wife Yulia are seen at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny is seen at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny is seen at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny enters a room at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny and his wife Yulia are seen at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny and his wife Yulia are seen at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny and his wife Yulia are seen at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

TOPSHOT Russian opposition leader Alexei Navalny is seen at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny is seen at the passport control point at Moscow's Sheremetyevo airport on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

A man takes a a selfie picture with Russian opposition leader Alexei Navalny and his wife Yulia in a Pobeda plane heading from Berlin to Moscow on January 17, 2021. - Chief Kremlin critic Alexei Navalny returns to Russia from Germany on January 17, facing imminent arrest after authorities warned they would detain him. The 44-year-old opposition leader is flying back to Moscow after spending several months in Germany recovering from a poisoning attack that he said was carried out on the orders of President Vladimir Putin. (Photo by Kirill KUDRYAVTSEV / AFP)

From L: Opposition leader Alexei Navalny's spokeswoman Kira Yarmysh, his wife Yulia Navalnaya and lawyer Olga Mikhailova sit in a hall of Moscow's Sheremetyevo airport upon the arrival from Berlin on January 17, 2021. - Russia's prison service confirmed Sunday that it had detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin. The prison service, the FSIN, said in a statement that it had detained Navalny for "multiple violations" of a 2014 suspended sentence for fraud charges, adding that "he will be held in custody" until a court ruling. (Photo by Kirill KUDRYAVTSEV / AFP)

Opposition leader Alexei Navalny's wife Yulia Navalnaya is seen surrounded by people as she leaves Moscow's Sheremetyevo airport upon the arrival from Berlin on January 17, 2021. - Russia's prison service confirmed Sunday that it had detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin. The prison service, the FSIN, said in a statement that it had detained Navalny for "multiple violations" of a 2014 suspended sentence for fraud charges, adding that "he will be held in custody" until a court ruling. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny is seen at Moscow's Sheremetyevo airport upon the arrival from Berlin on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

TOPSHOT Russian opposition leader Alexei Navalny and his wife Yulia walk towards the passport control point at Moscow's Sheremetyevo airport upon the arrival from Berlin on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny is seen at Moscow's Sheremetyevo airport upon the arrival from Berlin on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)

Russian opposition leader Alexei Navalny and his wife Yulia are seen at Moscow's Sheremetyevo airport upon the arrival from Berlin on January 17, 2021. - Russian police detained Kremlin critic Alexei Navalny at a Moscow airport shortly after he landed on a flight from Berlin, an AFP journalist at the scene said. (Photo by Kirill KUDRYAVTSEV / AFP)