Sir Keir Starmer and Emmanuel Macron have agreed to focus on migration at a July summit given the "deteriorating situation in the Channel" during a meeting at the G7 in Canada.
Both leaders agreed to "pursue high-ambition outcomes that deliver for the British and French people", a Downing Street spokesperson said.
They added: "Migration should be a key focus given the deteriorating situation in the Channel, they confirmed 鈥� adding that they should continue to work closely with other partners to find innovative ways to drive forward progress.
"They also agreed that the summit presents an opportune moment to further enhance our existing defence and security co-operation.
"Both leaders looked ahead to discussing Ukraine at the G7 tomorrow and underscored their enduring support for securing a just and lasting peace and keeping up the pressure on [Vladimir] Putin."