As Ukraine’s defenders and allies display a constellation of weaknesses, Russian forces are taking advantage and pushing forward in Donetsk Oblast. The Russians have begun their assault of Chasiv Yar, while a complementary, flanking assault is slowly pushing up from occupied Avdiivka, in an attempt to cut the supply road from Kramatorsk to Kostiantynivka. Chasiv Yar is the foyer of Kostiantynivka, a larger town that has served as an important Ukrainian military staging ground. “Their intention is to approach the main transit hubs and thereby render the defense of Donetsk (Oblast) systemically …