The US and its allies are planning to provide Ukraine with F-16 fighter jets, the White House has said.
The timing for when Kyiv will receive the aircraft, how many will be delivered, and which countries will provide them remains unclear, but an official stressed they will not be used for an upcoming counteroffensive against Russia.
It came as Ukrainian President Volodymyr Zelenskyy arrived in Japan for talks with G7 leaders.
On meeting at the summit with Rishi Sunak, the prime minister slapped him on the back after they greeted each other with an embrace.
Mr Sunak said: “Good to see you. You made it.”
Asked if it was a good day for Ukraine, Mr Zelenskyy smiled, nodded and said: “I think so.”
Mr Sunak updated the Ukrainian leader on the “very positive progress” on providing the fighter jets to Ukraine, Downing Street said.