Originally Posted by
Airlick
They probably couldn't, not without nukes. Even just on paper European NATO countries have a much stronger combined military than Russia, and that's without considering the fact that Russia couldn't just move all of its military west. Not only do they have internal issues that would force parts of their military to stay in place, it's also not really feasible moving tanks from Kamchatka to, say, Kaliningrad. Of course, there could be problems with cooperating on the EU side, in which case the rest of Ukraine, Baltic countries and Poland would get owned, but Russia wouldn't get any further than Germany. This is even assumed in the old NATO policy, back when Soviets were actually strong.