Russia claims to have used laser weapons on the battlefield in Ukraine, although the US says it has seen no evidence of this and Ukraine has derided it as propaganda. What are laser weapons and how effective could they be in the conflict?
Yury Borisov, the deputy prime minister in charge of military development, told Russian TV that a laser prototype called Zadira was being deployed in Ukraine and had burned up a Ukrainian drone within five seconds at a distance of 5km (three miles).
