[roenxi]

It doesn't take a war to do that, in peacetime governments can also manufacture reasons to just not do things - up to and including just changing the law. The main defence against that is that if they are going to do that later on they simply won't sign up for the deal, so we'd expect a government to honour anything they sign on with.

I'd imagine the logic goes something like Ukraine believes they are benefiting and Russia is too, but they aren't sure which side is gaining more from the movement of gas through Ukraine (which, note, in real terms is supporting the economies that are arming Ukraine). In that situation, the obvious thing to do is just let things play out as contracted. If it was obvious that Russia was gaining a lot more from the deal than they are then they'd just stop.