A drone rained down molten thermite on the battlefield in Ukraine, setting alight a line of trees, footage shows. The unmanned aerial vehicle is seen moving from left to right across the position, leaving orange flames and rising smoke. Thermite, a mixture of metal powder and metal oxide, is used in the making of incendiary bombs. Both Ukrainian and Russian sources have claimed credit for a video circulating on social media which appears to show a first-person view drone being used. The Independent has not verified either of these claims.