I'd expect what's feared most is a high-altitude EMP attack over the sea possibly around Denmark or closer to the UK but.. he takes the same. I'm predisposed to always attack, especially Russians (the grenade in my bedroom thing) but MAD rules still apply as always.
Of course it will just turn into a meat grinder on the ground. Having Boris still as PM in the UK is almost guaranteeing that.
Well I was more speaking to Putin will most likely want to escalate his messaging and setting off a nuclear bomb will get a lot of attention but no damage or loss of human life.
Setting off an EMP would most likely spark a chain of events we would not want to go down.