Can anything break the stalemate in the Ukraine war? Ukraine correspondent, James Waterhouse, tells the BBC's world affairs editor, John Simpson, about growing tensions for President Zelensky as so little progress is made on the frontline. As the UN exits countries in Africa, diplomatic correspondent, James Landale, asks if the organisation meant to promote peace, security, and cooperation around the world is still fit for purpose. Plus, science editor, Rebecca Morelle, shares the latest extraordinary discoveries in space.