I'm not sure why everyone is being dismissive of the OP. Relationships between East and West are at their lowest since probably Cuba and the OP understandably wants to have a decent discussion about it. Or does everything in AIBU have to be about inane subjects?
Dismissing it as willy waving is daft. The might be unpopular but I think US administrations instincts on this are possibly correct. How many times do we allow Assad to do this and do nothing? How many times do we let the Russians get away with assassinating people in the UK? How many elections do we allow them to meddle in?
Doing nothing like Obama or as Parliament voted for on 2013 hasn't done anything. Innocent men, women and kids are dying in their droves and we do nothing about it?
It might be easy call it willy waving, actually thats so dismissive and ridiculous. Do you think it would be different with Hillary in power? I'm no fan of his and the megaphone diplomacy of Trump isn't great but look behind the scenes and you will see the sanctions that he has imposed on Russia is making a real difference to their economy. I suspect Trump understands economic warfare rather better than he does military action.