UK leader Rishi Sunak travels to Warsaw on Tuesday for talks with Polish premier Donald Tusk and Nato chief Jens Stoltenberg that will focus on Ukraine and wider European security.

While in Poland’s capital, the British prime minister will announce £500 million ($617 million) in additional military funding for Kyiv in its more-than two-year battle against Russia’s full-scale invasion, his Downing Street office said in a statement.

“Defending Ukraine against Russia’s brutal ambitions is vital for our security and for all of Europe. If Putin is allowed to succeed in this war of aggression, he will not stop at the Polish border,” Sunak said ahead of the trip.