Russia is not playing. Russia is restoring USSR to the possible degree - minus Baltic states, minus all former Asian "-stans" (Uzbeki-, Tajiki- etc, except for KZ, as it has gas and oil), but it is very interesting question about Ukraine, dunno for sure. And while Mr.Putin is doing so, no real threats to US interests in Europe exist. China is another question. Last time I've been in China (a month ago), I've noted the Chinese regional maps on the walls in a government buildings - Taiwan is painted the very same colour that mainland China, and the whole Korean peninsula has almost the same colour, I barely could tell North from South even staring at the blank-point. As Taiwan and South Korea are much more important US allies in Asia than Ukraine or Georgia in Europe, it seems that if your definite enemy is going to appear soon, it won't be Russia...