They have no extradition treaty with the United States.
Russia
Zimbabwe
Venezuela
Switzerland
Iceland
Nicaragua
Bolivia
Cuba
Ecuador
China
Afghanistan
Belarus
Iran
Laos
Libya
Mongolia
Montenegro
Nepal
North Korea
Qatar
Yemen
But I think anyone who flees could still be arrested if they travel outside of these countries if there's an international arrest warrant for them and be brought back to the U.S. for trial.
Just a little trivia to know in case somebody tries to avoid a knock on their mansion door at 4AM.
I have a feeling if leftists fled to Russia, Russia would either kill them or hand them back to US to get rid of them.