It's the same thing as when the Iron Curtain started going up; One side breaks his verbal contract and then the other guy goes, huh your word aint watermelon why would I keep mine.
Verbal contracts are binding in many-a countries law. I'd bet that no leader wants to look like Neville Chamberlain signed paper in his hand, "Peace in our time", and then the next moment looking ridiculous.
"Shake my hand on a deal, and I'll never break my word. But get me to put it in writing, and I'll have my best team of lawyers looking for loopholes and ways to get out of it". I forget who said it
I do not support war, I do not support civilians being killed in this war, I do not support Vlad but this is the situation; Minsk Agreement agreed, Minsk agreement broken, last straw -> War
Whether we like it or not, back someone into a corner eventually they come out swinging.
If I step onto your property and you come out and tell me to leave, I say sure I've not intention to enter your house. The next hour you come out and I'm another step or two closer to your door, and you keep saying, please leave, everytime I make another step or two towards your door. You are eventually either be sat with me in your living room or a gun goes into your hand.
"It doesn't exist" they cry, "here it is" others say, You answer should be "Oh, now I understand" not "you used a source I trust, but it came from you therefore I don't trust it". But just as I thought, nothing would be good enough.. Gas, you trust wiki, said it yourself. You couldn't accept it and we have you wriggling to get out of it.
Fact/truth driven discussion is more constructive if harder to swallow, if you want an echo chamber go to social media.. I'm out, talk amongst yourselves.