Colour me cynical, but the EU crumpled and all fell out, broadly going their own way over open borders, at the first sign of pressure.
Italy and Greece have very much been left to it.
I can't see Brussels facing down the Russian military and acting on a widespread and coordinated scale. Many of them talk big, but add nothing (Luxembourg???), the Germans don't leave bases and many of the Eastern states seem to exist to keep the DFAC in business.
The Dutch, Danes, Poles and Estonians will end up doing the hard work, with the French making a valuable contribution, if they are in the mood.