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Otto Warmbier, 22, returned to the US last Tuesday, but it emerged he had been in a coma for a year.
North Korea said botulism and a sleeping pill led to the coma, but US doctors have questioned this account.
Mr Wambier was sentenced to 15 years of hard labour for attempting to steal a propaganda sign from a hotel.
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<p>The two leaders have discussed the Ukraine conflict, with the German chancellor calling on Moscow to hold peace talks with Kiev</p>