After several weeks of deadlock, Russia’s military appears to have found a way to advance in the Donbas – pounding it with such intense, unsophisticated artillery that Ukraine’s exhausted defenders are having to yield.Volodymyr Zelenskiy rarely gives casualty figures but Ukraine’s president said last Sunday that “50 to 100 Ukrainian troops die on Donbas frontlines each day”, meaning perhaps 3,000 a month in the grisly war of attrition.Wounded will typically be three or perhaps four times as much, a serious loss for a Donbas defence force estimated at 30,000 before the war began, although the numbers increased following Ukraine’s mass...