For interest I was gaming a potential crisis in the Ukraine. The scenario was an East West confrontation over dividing the country.
At that point I did not know that Ukraine, while not a member of NATO, had a memorandum of understanding with NATO. The question of whether this is legally binding to commit NATO to military action if Ukraine is attacked is one for international lawyers. However, there would be huge moral pressure on NATO to support an ally under attack.
So I was a little surprised to find the real world crisis is starting to resemble one of my wargames. Obviously, in my game, Russia could not stand up for long against a determined effort by NATO based in Poland. When faced with defeat, Russia started to deploy its heaviest weapons and my game stopped at the point of the crisis becoming Armageddon.
It is a somewhat surreal experience to see one of ones wargames played out in the real world. I just hope the politicians are operating at their finest to avoid this crises escalating down a one way path to a confrontation neither NATO nor Russia wants to face.