Russian President Vladimir Putin has declared a two-day ceasefire in the conflict with Ukraine on May 8-9 to mark the anniversary of the defeat of Nazi Germany in World War II, Russia's defence ministry says.The ministry added that it counted on the Ukrainian side to follow suit and that Russia would launch a massive retaliatory missile strike on the centre of Kyiv if Ukraine attempted to disrupt Victory Day celebrations in Moscow."Despite the capabilities at our disposal, Russia has previously refrained from such actions on humanitarian grounds," it said in a statement, adding however that it was ready to act...