PITTSBURGH (KDKA) — Marc Fogel is finally back in the U.S. after three and a half years in a Russian prison. After that much time away in what was almost isolation, there is an acclimation process.

The U.S. and Russia agreed to a prisoner swap involving Marc Fogel, an American schoolteacher who the Biden administration had deemed wrongfully detained by Russia, in a diplomatic move that the White House said could move forward negotiations to end the war in Ukraine.