past the point of a diplomatic resolution. putin has eliminated the last realistic off-ramp for the crisis. he signed away the possibility of achieving his political aim of veto over ukraine's geopolitical orientation without a military offensive. only real bad diplomatic options remain. one of the major parties must now cap i.t. late to avoid military hostilities. the west would need to abstain from responding today's major attack to the international system and concede to russia a veto over european security. ukraine has no diplomatic path, with russia as the minsk format is dead. russia would need to recognize ukraine as a sovereign state. putin mocked the very idea, and return 100,000 troops to bases without achieving his main objects and while facing the risk of major sanctions. with the stroke of a pen, putin has locked in a collision