The Neo-Cons and other fools currently running US foreign policy think they can do anything they want, when they want, without repercussions or 'emergent' counter-actions.
Russia is providing a Learning Experience.
Oh, that always ends well... "Pretending that you already know the answer when you don't is not actually very helpful." ~Migeru.
Russia has been saying from the git-go if the US put anti-missile batteries in Eastern or Central Europe there would be consequences.
Rice, et.al. told them to go play with it.
Now they are showing what they can do. Restocking the air bases in Cuba, and possibly putting a military presence in Venezuela, is exactly the reaction predictable: a Tit-for-Tat strategy under Two Player Game Theory.
That said, you don't want Russia teaching you a lesson. No fun. "Pretending that you already know the answer when you don't is not actually very helpful." ~Migeru.