Keir Starmer's appearance on Sunday with Laura Kuenssberg precedes what will be a jam-packed day for the prime minister.
For the latest on his upcoming meeting with Zelensky and a summit of European leaders, head to our dedicated live page.
If you missed his interview or need a recap, here's what he said:
OnUS President Donald Trump's meeting with Ukraine's Volodymyr Zelensky on Friday, and the fallout, Starmer said: "Nobody wants to see that"
The UK and France will work with Kyiv to stop the war with Russia, and discuss the plan with the US going forward, the prime minister tells Laura
Starmer named his three essential points to achieve "lasting peace"; a strong Ukraine, a European element with security guarantees, and a US backstop
The prime minister told Laura he doesn't trust Putin but he does trust both Trump and Zelensky - using the opportunity to highlight again the relationship between the UK and the US