FILE - In this Sunday, Jan. 31, 2021, police officers detain a man during a protest against the jailing of opposition leader Alexei Navalny in Moscow, Russia. Unprecedented nationwide protests have rocked Russia for two weekends in a row, with tens of thousands rallying in support of opposition leader Alexei Navalny. Detainees are recounting their miserable experiences as Moscow jails were overwhelmed following mass arrests from protests in support of opposition leader Alexei Navalny this week. (AP Photo/Alexander Zemlianichenko, File)

FILE - In this Sunday, Jan. 31, 2021 file photo, people clash with police during a protest against the jailing of opposition leader Alexei Navalny in Moscow, Russia. Unprecedented nationwide protests have rocked Russia for two weekends in a row, with tens of thousands rallying in support of opposition leader Alexei Navalny. Detainees are recounting their miserable experiences as Moscow jails were overwhelmed following mass arrests from protests in support of opposition leader Alexei Navalny this week. (AP Photo/Alexander Zemlianichenko, File)

In this Sunday, Jan. 31, 2021 file photo, detained protesters walk escorted by police during a protest against the jailing of opposition leader Alexei Navalny in St. Petersburg, Russia. Unprecedented nationwide protests have rocked Russia for two weekends in a row, with tens of thousands rallying in support of opposition leader Alexei Navalny. Detainees are recounting their miserable experiences as Moscow jails were overwhelmed following mass arrests from protests in support of opposition leader Alexei Navalny this week. (AP Photo/Dmitri Lovetsky, File)

FILE - In this Tuesday, Feb. 2, 2021 file photo, riot police officers detain Navalny supporters pushing them into police vans near Red Square in Moscow, Russia. Unprecedented nationwide protests have rocked Russia for two weekends in a row, with tens of thousands rallying in support of opposition leader Alexei Navalny. Detainees are recounting their miserable experiences as Moscow jails were overwhelmed following mass arrests from protests in support of opposition leader Alexei Navalny this week. (AP Photo/Denis Kaminev, File)

This photo released by Philipp Kyznetsov in his Instagram account philipp_kuznetsov, shows him, right, posing for a selfie with a group of detained people inside the police bus in Moscow, Russia, Wednesday, Jan. 27, 2021. Filipp Kuznetsov was arrested on Jan. 23, 2021 and sentenced to 10 days in jail on Jan. 25, 2021, but he didn't get into his jail cell until two nights later. Kuznetsov told the AP he spent the first night at a police precinct, and the second night in a police bus waiting for the detention center to accommodate him and about 20 others. (philipp_kuznetsov via AP)

Marina Litvinovich, member of Moscow's Public Monitoring Commission speaks during her interview with the Associated Press in Moscow, Russia, Wednesday, Feb. 3, 2021. Litvinovich said that besides Sakharovo, there were at least four more detention centers outside Moscow where arrested protesters were taken. Each of those facilities could accommodate about 30 people, and all of them have already been filled. (AP Photo/Alexander Zemlianichenko)

This image taken from a video filmed by Dmitry Shelomentsev shows, a group of detained people inside the deportation centre Sakharovo, 70km (43,7 miles) south-west of Moscow which was urgently transformed into a detention center in the absence of prison space, in Moscow, Russia, Thursday, Feb. 4, 2021. Dmitry Shelomentsev was among those who had to wait in a police bus for hours at Sakharavo before being taken in. Sentenced to 15 days in jail for participating in the Tuesday rally, Shelomentsev messaged the AP reporter on Feb. 4, 2021 morning from a cell for eight inmates where 28 people were held, awaiting transfer to smaller ones. (Dmitry Shelomentsev via AP)

This photo released by Philipp Kuznetsov in his Instagram account philipp_kuznetsov, shows him, right, posing for a selfie with a group of detained people inside the police bus in Moscow, Russia, Tuesday, Jan. 26, 2021. Filipp Kuznetsov was arrested on Jan. 23, 2021, and sentenced to 10 days in jail on Jan. 25, 2021, but he didn't get into his jail cell until two nights later. Kuznetsov told the AP he spent the first night at a police precinct, and the second night -- in a police bus waiting for the detention center to accommodate him and about 20 others. "It was a very unpleasant situation," Kuznetsov said. (philipp_kuznetsov via AP)

A police bus drives out of the deportation centre Sakharovo, 70km (43,7 miles) south-west of Moscow which was urgently transformed into a detention center in the absence of prison space, Wednesday, Feb. 3, 2021. Marina Litvinovich of the Public Monitoring Commission said that besides Sakharovo, there were at least four more detention centers outside Moscow where arrested protesters were taken. Each of those facilities could accommodate about 30 people, and all of them have already been filled. (AP Photo/Pavel Golovkin)

This image taken from a video filmed by Dmitry Shelomentsev shows, facilities in the cell with a group of detained people at the deportation centre Sakharovo, 70km (43,7 miles) south-west of Moscow which was urgently transformed into a detention center in the absence of prison space, in Moscow, Russia, Thursday, Feb. 4, 2021. Shelomentsev said there were not enough beds for everyone in the cell, and that they were given two five-liter jugs of drinking water with no paper cups. A short video he sent the AP showed men crammed on metal bunk-beds with no mattresses, a pit latrine, stained walls. (Dmitry Shelomentsev via AP)

Eva Sokolova, foreground, walks out of the deportation centre Sakharovo, 70km (43,7 miles) south-west of Moscow which was urgently transformed into a detention center in the absence of prison space where she has spent 3 days outside Moscow, Russia, Wednesday, Feb. 3, 2021. Eva Sokolova slept two nights on the floor of police precinct before the court jailed her for three days. Other detained protesters brought to Sakharovo in conversations with the AP also described night-long waits in police buses, hot cells and a line they had to stand in for hours outside of the facility to pass on food and other necessities to their loved ones. (AP Photo/Pavel Golovkin)

Alexei Medvedev, teacher at the Moscow Film School, center, and other relatives and friends of jailed protesters wait to hand over food and warm clothes at the deportation centre Sakharovo, 70km (43,7 miles) south-west of Moscow, Russia, Wednesday, Feb. 3, 2021. Dozens of relatives queued outside the centre for hours to bring food and necessities to their closes. (AP Photo/Pavel Golovkin)

This photo taken by Dmitry Shelomentsev, shows a group of detained people inside the deportation centre Sakharovo, 70km (43,7 miles) south-west of Moscow which was urgently transformed into a detention center in the absence of prison space, Russia, Thursday, Feb. 4, 2021. Dmitry Shelomentsev was among those who had to wait in a police bus for hours at Sakharavo before being taken in. Sentenced to 15 days in jail for participating in the Tuesday rally, Shelomentsev messaged the AP reporter on Feb. 4, 2021 morning from a cell for eight inmates where 28 people were held, awaiting transfer to smaller ones. After five hours in a crowded cell, Shelomentsev was transferred to a smaller one -- for four people. (Dmitry Shelomentsev via AP)