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Ukraine's president, Volodymyr Zelenskiy, addressed the US Congress seated in a high-backed office chair with a plain white wall behind him and a prominently-displayed Ukrainian flag to his right.

He was neatly turned out with a trimmed beard and wearing what has become his characteristic combat-green tee shirt, since Russia invaded Ukraine last month and he was forced to shelter in a hidden bunker somewhere in Kyiv with his top team.