In this June 30, 2019, file photo, President Donald Trump shakes hands with North Korean leader Kim Jong Un in the Demilitarized Zone, South Korea.

Video. US foreign policy: How will Biden or Trump deal with friends and foes?

It's perhaps over Russia the two men differ most strongly. Trump has seemed reluctant to criticise President Putin at times, even when US intelligence concluded the Kremlin had interfered in the 2016 election. Whereas Biden has signalled he would take a much firmer line with Moscow

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