US President Joe Biden and his British counterpart Rishi Sunak called Russian President Vladimir Putin’s attacks on Ukrainian civilians at a G20 summit in Bali on Wednesday “barbaric”.

“At a moment when world leaders are here in Bali trying to make progress on world peace, Putin is attacking civilian targets – children, women. I mean, it’s almost – my words, not yours – barbaric,” Biden said of a meeting with Sunak.

The British Prime Minister, who met Biden for the first time since taking office, said: “I agree with your words – barbaric.”

They spoke as tensions rose over the deaths of two people when a missile landed in Poland, across the Ukrainian border.

Western officials have been cautious in assigning blame, and Biden said the trajectory appears to preclude the weapon being fired “from Russia.”

Russia has launched waves of rockets across Ukraine, often at civilians, after being expelled from the city of Kherson, which Moscow occupied and declared Russia.

“It’s way over the top,” Biden said. “Russia can and should end the war.”

Biden told Sunak they were “on the same page in support of the Ukrainian people’s right to be free from any Russian forces in their country.”