NATO's Washington summit takes place amid growing uncertainty about US leadership, and some of Russia's heaviest missile attacks on Ukraine since the start of the war. Bronwen Maddox is joined by two former US ambassadors to NATO, Kurt Volker and Ivo Daalder, to discuss the challenges facing the alliance. With them is The Telegraph's Roland Oliphant and Chatham House's Armida van Rij.

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Presented by Bronwen Maddox. Produced by John Pollock.

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