Does it matter? One nuke goes then 3000* more follow. Only France & UK could even touch them.If Russia invaded the Ukraine and then on to Poland what would the EU do about it?
Nothing, because they need Russian gas.
If the EU decided to fight a war with Russia, should the UK get involved? Given their attitude towards paying into NATO, I doubt it.
We have about 300 between us.
The Nuclear Deterent we have (that Corbyn wants to give up) may encourage them to stop at France & UK.
*Assumption that 50% dont work.