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I can see Trump's Nobel peace prize slipping away.
The highly anticipated meeting between Mr Trump and North Korea's Kim Jong-un is due to take place on 12 June.
But in an angry statement, North Korea's vice-foreign minister accused the US of making reckless statements and of harbouring sinister intentions.
He pointed the finger squarely at US National Security Adviser John Bolton.
Mr Bolton recently said North Korea could follow a "Libya model" of verifiable denuclearisation, but this alarms Pyongyang, which watched Libya's Colonel Gaddafi give up his nuclear programme only for him to be killed by Western-backed rebels a few years later.
The BBC's Laura Bicker in Seoul says North Korea - which had long said its nuclear arsenal is essential for its survival as a state - is now making its demands clear.