So far the actions against Georgia seem to be exclusively to prevent th Georgian military to mount a similar assault in the future.
As for Poland being a nuclear target, in the event of war, all US military targets are automatically targets for military action. So what other response did the US expect to establishing a military presence in Poland, which is so clearly aimed at Russia?
The first situation was at least partially engineered by the US, the second completely so. Yes, that is why I call the Westen policy "crazy"