NATO and Russia have been enemies since the beginning of the Cold War. But could there be a time in the future where Russia is a partner, maybe even an ally? That's not happening any time soon, but if history is any indication, it's not such a crazy idea: alliance has absorbed its enemies before.

GZERO World goes back in time to the height of the Cold War, nuclear paranoia, and the formation of the Warsaw Pact in 1955.