Russian state television showed video on Friday of two U.S. military veterans who went missing last week while fighting in Ukraine, confirming that the men were captured and raising fears about their fates, The Associated Press has reported.

There has been no confirmation from either the Russian or U.S. government.

Alex Drueke and Andy Huynh, both from Alabama, are believed to be the first Americans captured by Russian forces since the conflict began on February 24.

U.S. President Joe Biden said Friday that he has been briefed on the situation, according to CNN. "We don't know where they are, but I want to reiterate: Americans should not be going to Ukraine now," Biden said at the White House.