U.S. President Joe Biden and Russia's President Vladimir Putin meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

U.S. President Joe Biden and Russia's President Vladimir Putin shake hands as they arrive for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021. REUTERS/Kevin Lamarque

U.S. President Joe Biden and Russia's President Vladimir Putin meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021. REUTERS/Kevin Lamarque

U.S. President Joe Biden and Russia's President Vladimir Putin shake hands as they arrive for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021. REUTERS/Kevin Lamarque

U.S. President Joe Biden and Russia's President Vladimir Putin meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

U.S. Secretary of State Antony Blinken looks on as he and U.S. President Joe Biden meet Russia's President Vladimir Putin and Russia's Foreign Minister Sergei Lavrov for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

Members of the security stand guard around Villa La Grange during the U.S.-Russia summit, in Geneva, Switzerland, June 16, 2021.

Russia's President Vladimir Putin holds a news conference after the U.S.-Russia summit with U.S. President Joe Biden at Villa La Grange in Geneva, Switzerland, June 16, 2021.

Russian President Vladimir Putin gestures as he speaks during a news conference after his meeting with U.S President Joe Biden at Villa La Grange in Geneva, Switzerland June 16, 2021. Alexander Zemlianichenko/Pool via REUTERS

U.S. President Joe Biden gestures while speaking to the media before boarding Air Force One at Geneva airport, as he leaves Geneva after the U.S.-Russia summit, Switzerland, June 16, 2021.

Russia's President Vladimir Putin looks on during the U.S.-Russia summit with U.S. President Joe Biden (not pictured) at Villa La Grange in Geneva, Switzerland, June 16, 2021.

Swiss President Guy Parmelin, U.S. President Joe Biden and Russia's President Vladimir Putin pose for a photo at Villa La Grange during the U.S.-Russia summit, in Geneva, Switzerland, June 16, 2021. REUTERS/Kevin Lamarque

U.S. President Joe Biden reacts during the U.S.-Russia summit with Russia's President Vladimir Putin (not pictured) at Villa La Grange in Geneva, Switzerland, June 16, 2021.

U.S. President Joe Biden and Russia's President Vladimir Putin meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

A security officer indicates to the media to step back as U.S. President Joe Biden, U.S. Secretary of State Antony Blinken, Russia's President Vladimir Putin and Russia's Foreign Minister Sergei Lavrov meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

U.S. President Joe Biden and Russia's President Vladimir Putin shake hands during the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

People watch as the motorcades of U.S. and Russian Presidents drive toward Villa La Grange ahead of the U.S.-Russia summit, in Geneva, Switzerland, June 16, 2021. Fabrice Coffrini/Pool via REUTERS

U.S. President Joe Biden holds a news conference after the U.S.-Russia summit with Russia's President Vladimir Putin, in Geneva, Switzerland, June 16, 2021.

Russia's Foreign Minister Sergei Lavrov, Russian Presidential Aide Yuri Ushakov and Chief of the General Staff of Russian Armed Forces Valery Gerasimov wait for the news conference of Russia's President Vladimir Putin after the U.S.-Russia summit with U.S. President Joe Biden at Villa La Grange in Geneva, Switzerland, June 16, 2021.

U.S. President Joe Biden gestures as he holds a news conference after the U.S.-Russia summit with Russia's President Vladimir Putin, in Geneva, Switzerland, June 16, 2021.

U.S. President Joe Biden and Russia's President Vladimir Putin meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland June 16, 2021. Sputnik/Mikhail Metzel/Pool via REUTERS

U.S. President Joe Biden and Russia's President Vladimir Putin meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

Russian President Vladimir Putin and U.S President Joe Biden shake hands during their meeting at Villa la Grange in Geneva, Switzerland June 16, 2021. Alexander Zemlianichenko/Pool via REUTERS

Russia's President Vladimir Putin looks on during the U.S.-Russia summit with U.S. President Joe Biden (not pictured) at Villa La Grange in Geneva, Switzerland, June 16, 2021.

Russia's President Vladimir Putin waves as he arrives for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

Russia's President Vladimir Putin holds a news conference after the U.S.-Russia summit with U.S. President Joe Biden at Villa La Grange in Geneva, Switzerland, June 16, 2021.

U.S. President Joe Biden poses with staff members before boarding Air Force One at Geneva airport, as he leaves Geneva after the U.S.-Russia summit, Switzerland, June 16, 2021.

Russia's President Vladimir Putin reacts during the U.S.-Russia summit with U.S. President Joe Biden (not pictured) at Villa La Grange in Geneva, Switzerland, June 16, 2021.

U.S. President Joe Biden and Russia's President Vladimir Putin meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

Russia's President Vladimir Putin reacts as he meets U.S. President Joe Biden for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland, June 16, 2021.

U.S. President Joe Biden holds a news conference after the U.S.-Russia summit with Russia's President Vladimir Putin, in Geneva, Switzerland, June 16, 2021.

Russian President Vladimir Putin gets into a limousine as he leaves Villa La Grange after his meeting with U.S President Joe Biden in Geneva, Switzerland June 16, 2021. Alexander Zemlianichenko/Pool via REUTERS

U.S. President Joe Biden arrives at Villa La Grange for the U.S.-Russia summit, in Geneva, Switzerland, June 16, 2021.

The motorcade of U.S. President Joe Biden and its delegation members drives toward the Villa La Grange ahead of the U.S.-Russia summit, in Geneva, Switzerland, June 16, 2021. Fabrice Coffrini/Pool via REUTERS

Russia's President Vladimir Putin leaves after the U.S.-Russia summit, in Geneva, Switzerland, June 16, 2021.

Russian president Vladimir Putin and Swiss Federal President Guy Parmelin are led to their meeting room by Swiss head of protocol Beatrice Schaer, ahead of U.S. - Russia summit, in Geneva, Switzerland, June 16, 2021. Peter Klaunzer/Pool via REUTERS

U.S. President Joe Biden and Russia's President Vladimir Putin meet for the U.S.-Russia summit at Villa La Grange in Geneva, Switzerland June 16, 2021. Sputnik/Mikhail Metzel/Pool via REUTERS

U.S. President Joe Biden puts on sunglasses as he leaves after a news conference, following the U.S.-Russia summit with Russia's President Vladimir Putin, in Geneva, Switzerland, June 16, 2021.