Moscow this morning hailed the ‘liberation’ of Soledar, a strategic point in the battle for control of the eastern Donbas region of Ukraine. The Wagner Group’s Yevgeny Prigozhin said on Wednesday that his mercenaries – who are spearheading the offensive – were in control of the salt-mining town (or what remains of it). It was denied at the time, but the Washington-based Institute for the Study of War (ISW) has said it believes Russian forces have taken ‘most, if not all’ of the town.

Ukraine insists that the fighting is ongoing and that its soldiers ‘are bravely trying to hold the defence’, but the institute says this probably refers...