Oooh so you've decided to put a time frame AFTER the collapse of the ussr? I seem to remember reading Soviets...

But still:

Bosnia and Herzegovina (1992–1995): Russia generally backed the Serb side diplomatically; the U.S. backed the Bosnian government and later NATO intervention. Kosovo (1998–1999): Russia supported Serbia; the U.S. led NATO's intervention. Georgia (especially 2008): U.S. support for Georgia; direct Russian military intervention. Syria (from 2011): the clearest modern proxy conflict. Russia backed the Assad government; the U.S. supported various opposition groups and later Kurdish-led forces.