Ukraine struck a railway depot and knocked out power in the Russian-occupied city of Melitopol, deep behind the front line, on Wednesday, amid growing talk from Kyiv of a counterassault against Russian forces worn out by a failed winter offensive. The average number of daily Russian attacks on the front line reported by Ukraine’s general staff has declined for four straight weeks since the start of March, to 69 in the past seven days from 124 in the week of March 1-7. Russian missile exerciseAway from the battlefield, Russian ally Belarus said it decided to host Russian tactical nuclear weapons as a response to Western sanctions and what it said was a military build-up by Nato member states near its borders