The so-called Minsk 2 accord, signed recently by the Ukrainan government and the separatists (but not the mediators), appears to collapse. Hostilities are continuing. The Russian president appears to be unimpressed by Western appeals to stop (or at least not support) the separatists. The only move not tested so far is a credible Western attitude of applying counter-force if required. Alas, difficult questions of escalation dominance are attached here.