The UK subs as ours and France can totally destroy Russia as can they us. Nuclear warfare is a lose lose game on both sides. In relationship to non nuclear warfare Russia has demonstrated themselves as inferior and this surprised me.
Nato would destroy them in conventional warfare. If it went nuclear we all die.
Given that Ukraine lost about 2500 pieces of armor, exhausted most of the NATO ATGM and MANPAD arsenal sent to it and still failed to mount a single counter-offensive, I wouldn’t be so sure about the conventional part.