At least one person has been killed after Russia launched its largest drone attack on Ukraine since the beginning of its invasion, Ukrainian officials said Wednesday, just hours after US President Donald Trump pledged more military support for Kyiv and accused his Russian counterpart Vladimir Putin of throwing “bullsh*t” over peace talks.

Russia fired a record 728 Shahed and decoy drones at Ukraine overnight, as well as 13 cruise and ballistic missiles, the Ukrainian air force said, in the latest escalation after weeks of mounting Russian aerial and ground attacks in the more than three-year war.

Trump has been threatening sanctions on Russia since taking office in January but has so far failed to impose any. In June, he stated that he pointed out sanctions "cost a lot of money" and signalled he was waiting to see whether a deal between Russia and Ukraine would be signed instead.