Any way you count it, the figures are stark: Ukrainian casualties are running at a rate of somewhere between 6oo and 1,000 a day. One presidential adviser, Oleksiy Arestovych, told the Guardian this week it was 150 killed and 800 wounded daily; another, Mykhaylo Podolyak, told the BBC that 100 to 200 Ukrainian troops a day were being killed. It represents an extraordinary loss of human life and capacity for the defenders, embroiled in a defence of the eastern city of Sievierodonetsk that this week turned into a losing battle. Yet the city was also arguably a place that Ukraine could have retreated from to the more defensible Lysychansk, across the Siverski Donets River, the sort of defensive situation that Ukraine has fared far better in.