U.S. President Donald Trump says diplomatic efforts with North Korea are going well, even as Pyongyang is warning its patience is wearing thin. In a statement coinciding with the one-year anniversary of Trump's summit with Kim Jong Un in Singapore, a North Korean foreign ministry official Wednesday warned "the U.S. would be well-advised to change its current method of calculation."  VOA Diplomatic Correspondent Cindy Saine has more from the State Department.

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