This is...not true. Attacking key infrastructure is an act of war. Just because they try to do it secretly doesn't change that fact. 'Grey zone' tactics doesn't make any difference here. Green men, intel services, etc. are still government entities acting at the behest of the leadership to commit acts of war.

The argument here is about appeasement or not. If you allow continued acts of war to pass without response, you get more of them. This is the lesson of bullies from the playground to WW2. I'm more than willing to have a conversation about what sort of response is the best, but saying that Russia is not a warmonger is incorrect - they are committing acts of war. Just because no one has called them on it yet doesn't make it not warmongering.