The Ukrainian president, Volodymyr Zelenskiy, has given a defiant address to a joint session of the US Congress in which he vowed that his country would never abandon its resistance to Russian aggression – but said that Washington’s continued support is key to ultimate victory. Zelenskiy was received with a standing ovation as he arrived to speak wearing his now trademark green military-style trousers and shirt. The Ukrainian leader was repeatedly met with long bursts of applause as he invoked US battles against Nazi Germany and President Franklin Roosevelt’s wartime commitments in a bid to keep American weapons supplies flowing...