Downing Street's virtual summit of Ukraine allies may have given those countries a greater sense of unity, but the war continues in Ukraine and President Putin is still prevaricating over the 30-day ceasefire proposed by the US and accepted by Ukraine. William Crawley explores how morally justified it would be to say 'no' to a ceasefire, with journalist and author Lucy Ash.

Also on the programme, in his Times column for this year's Ash Wednesday, Giles Coren tells the story of his own waning atheism and gradual embrace of Christian faith. Though Giles was raised in a Jewish home he had “no Hebrew classes, no Jewish environment, no bar mitzvah”. He shares how he finds comfort within the traditions of English Anglicanism.

The Dalai Lama, the 89-year-old spiritual leader of Tibetan Buddhism, is worried that his successor could be chosen by the Chinese government. In his new memoir, he says he will choose to be reincarnated in a successor outside China, and instructs his followers to reject any successor chosen by China. Tibetan Buddhism now faces a very awkward possible future - with two competing Dalai Lamas. To discuss this on the Sunday programme is Professor Robert Barnett, one of the world's leading experts on Tibetan history.

Presenter: William Crawley Producers: Bara'atu Ibrahim & Amanda Hancox Studio Managers: Amy Brennan and Sam Mills Production Coordinator: Kim Agostino Editor: Chloe Walker

Live from Rome - all you need to know about Pope Leo XIV