World leaders are gathering in Washington for the Nato summit and Ukraine is high on the agenda. The military alliance, which is marking its 75th anniversary, will also be closely watching US President Joe Biden whose recent halting debate performance has left many wondering if he’s up for the task. Kurt Volker, former US Ambassador to Nato, tells us whether he thinks the alliance could survive a Trump presidency. Today’s episode is presented by Victoria Derbyshire and Vitaly Shevchenko. The producers were Arsenii Sokolov, Cordelia Hemming and Sanjana Idnani. The technical producer was Jack Graysmark. The series producer is Tim Walklate. The senior news editor is Sam Bonham. Email Ukrainecast@bbc.co.uk with your questions and comments. You can also send us a message or voice note via WhatsApp, Signal or Telegram to +44 330 1239480 You can join the Ukrainecast discussion on Newscast’s Discord server here: tinyurl.com/ukrainecastdiscord