[variaga]

Ukraine did not go to war, Russia went to war, and Ukraine had a "local" deal with Russia (in exchange for Ukraine giving up their nukes, Russia promised to honor their territorial integrity), Russia simply refused to honor their half of the deal.

[FpUser]

The initial deal as I remember was with Russia, US and UK. And the deal was a memoranda which is not even binding and does not compel any real actions in case of breach. Basically Ukraine had acted as a fool.

Immediately after break up from USSR they had 50+ million population, strong army, industry, tech, great location as a transit hub, agriculture, resources etc. and their fucking corrupt "leaders" pissed it all away an had turned their country into an easy prey and a shadow of its former self.