As a Brit, I would never support the deployment if Trident against a foreign country unless they were using theirs on us. Besides, we wouldn't need to nuke Russia if they were just being aggressive. If NATO would pull their socks up, Russia would back down. Russia is only being aggressive because it knows the west is scared, in reality it knows that the UK, France, and US would beat them and they'd back down if it looked like NATO would actually go to war, I think