We won the Cold War, but not totally. The objective was to outlive the other superpower, and we did. The Soviet Union is gone, and we're still here.
Russia still exists, and is struggling with democracy - still has plenty of potential for communist hardliners to stage a coup and try to regain what they lost. Yes, it would be a lot harder than in the days/months/years after Nazi Germany would be defeated, but they're still capable of a razed earth strategy ala Chechnya.
Instability in Russia can still boil over into some sort of new Russian Federation. The goal, per se, was met, but leaving a powerful country tottering on one leg has parallels with what happened in Germany in the 20's.