Ukrainian drone strikes have heightened anxiety across Moscow ahead of this year’s May 9 parade on Red Square, where President Vladimir Putin will be watching with other leaders.

Russia on Friday paraded combat drones that its forces use in the war in Ukraine on Moscow's Red Square in what state TV said was a first.

Russia says Ukraine launched a drone attack on Moscow - days before the start of a ceasefire, ordered by Russian President Vladimir Putin to coincide with a World War Two parade. Moscow's four major airports shut for a few hours on Tuesday amid the barrage, authorities said. There were no casualties and Ukraine has not commented.