[IronDuke99]

I am certain UK would use nuclear weapons in response to a nuclear attack on British territory and, perhaps, on British forces. A large scale Chemical attack, that caused a lot of casualties, might also trigger that response. I am not sure much else would, outside an actual attempted invasion, or that it should.

I really cannot see why on earth the EU, or NATO, wants the Baltics to be in their orbit rather than being a more or less neutral buffer zone between Russia and the West. To me exactly the same thing applies to Ukraine. I would try to defend nothing further East than Poland.

To my mind the EU has many, huge, internal political problems, and next to no military muscle -especially since Brexit- to back it up its extravagant ambitions. The EU's, largely unelected, political elites attempts to create EU armed forces are not only almost certainly doomed to failure but are actually very dangerous from the point of view of NATO, that remains the actual cornerstone of Western European defence and security.

To put it bluntly if the USA loses interest in NATO, Europe is up s..t creek without a paddle.