FILE - In this photo taken from video released by the Moscow City Court Press Service, Stephen Hubbard, a U.S. citizen accused of fighting as a mercenary in Ukraine against Russia stands in a glass cage during a court session in the Moscow City court in Moscow, Russia, Oct. 7, 2024. (Moscow City Court Press Service via AP, File)

Russian presidential envoy Kirill Dmitriev, right, greets U.S. special envoy Steve Witkoff at the international airport outside St. Petersburg, Russia, Wednesday, Oct. 21, 2026. (TASS Photo via AP)

FILE - Stephen Hubbard, a U.S. citizen accused of fighting as a mercenary in Ukraine against Russia shows up in a video link as he stands in a glass cage during a court session in the Moscow City court in Moscow, Russia, Monday, Oct. 7, 2024. (AP Photo/Alexander Zemlianichenko, File)

Russian President Vladimir Putin, left, and U.S. President Donald Trump's special envoy Steve Witkoff, second right, attend the talks, as Russian Presidential Envoy Kirill Dmitriev, right back to a camera, and Kremlin foreign policy adviser Yuri Ushakov, third left, sit near at the Konstantin Palace in Strelnya, outside St. Petersburg, Russia, on Wednesday, Oct. 21, 2026. (Kristina Solovyova, Sputnik, Kremlin Pool Photo via AP)

A rescue worker clears the rubble from a multi-story residential building damaged in a Russian drone strike in Kyiv, Ukraine, Wednesday, Oct. 21, 2026. (AP Photo/Evgeniy Maloletka)

Policemen walk in front of destroyed cars in the yard of a multi-storey residential building damaged by a Russian drone strike on Kyiv, Ukraine, Wednesday, Oct. 21, 2026. (AP Photo/Evgeniy Maloletka)

U.S. President Donald Trump's special envoy Steve Witkoff, left, gestures during his meeting with Russian President Vladimir Putin at the Konstantin Palace in Strelnya, outside St. Petersburg, Russia, on Wednesday, Oct. 21, 2026. (Gavriil Grigorov, Sputnik, Kremlin Pool Photo via AP)

President Donald Trump speaks in the Oval Office of the White House, Tuesday, Oct. 20, 2026, in Washington, as Vice President JD Vance listens. (AP Photo/Jacquelyn Martin)