More than 4 million Ukrainians have fled their war-torn homeland since late February. An untold number are displaced inside the country and some are trapped at home without access to water, electricity or heat in places like Mariupol. This week, Major interviews David Miliband, former British Foreign Secretary and current head of the International Rescue Committee, to discuss the ongoing refugee crisis in Eastern Europe and the brutality of Vladimir Putin's assault on Ukraine.

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