The Taliban collapsed within a month of our invasion. So did Iraq.
We are really good at destroying the current power. However fighting the insurrection afterwords is far tougher. I imagine an invasion of Russia, and let's pretend it wouldn't devolve into a nuclear war (it would), we would destroy the current government of Russia and eventually find Putin. However, we wouldn't stick around very long with an occupation.
Or we would because we can do stupid things over and over again. But there's a lot of money to be made off of stupidity.