BREAKING - Ukrainian President Zelensky arrives in Britain seeking more arms

In Britain, he will meet Prime Minister Rishi Sunak and King Charles and address parliament.

"The United Kingdom was one of the first to come to Ukraine's aid. And today I'm in London to personally thank the British people for their support and Prime Minister Rishi Sunak for his leadership," Zelenskiy wrote on Telegram, under a photo of him and Sunak at the airport.

Britain, which has been training Ukrainian troops, said the extra training would ensure Ukrainian pilots were able to fly "sophisticated NATO-standard fighter jets in the future", adding the move was "part of long-term investment in their military".