British Prime Minister Rishi Sunak on Friday said he welcomed Washington's announcement of warplane support for Ukraine against Russia.

"Welcome announcement that the US will approve the training of Ukrainian pilots on F-16 fighter jets. The UK will work together with the USA and the Netherlands, Belgium and Denmark to get Ukraine the combat air capability it needs," Sunak tweeted.

Earlier Friday, US President Joe Biden told G7 leaders that Washington will support providing advanced warplanes including F-16s to Ukraine and will back efforts to train Kyiv's pilots, a senior White House official said.

Ukrainian President Volodymyr Zelensky, who is set to attend the G7 summit in Japan, hailed the move on Twitter as a "historic decision," adding that he looked forward to "discussing the practical implementation" of the plan in Hiroshima.

Biden said the United States "will support a joint effort with our allies and partners to train Ukrainian pilots on fourth-generation fighter aircraft, including F-16s, to further strengthen and improve the capabilities of the Ukrainian Air Force," the official said.

"As the training takes place over the coming months, our coalition of countries participating in this effort will decide when to actually provide jets, how many we will provide, and who will provide them."