@jouni, the USA and Europe that you define is not going to stay that way. Europe will soon fray. Europe is not a single political entity. The European Union does not have qualities of a State. European Union has qualities of a federation but its collective security policy is weak.
The very fact that USA forces are dominant in security structures of EU shows that EU is not ready to take responsibility for its own security.
Somebody has to call EU's bluff. Let it be Russia.
Political alliances do not stay the same forever.
A lot of people come forward to join the victor.