The United States has blocked efforts by a U.N. agency to improve civil aviation in North Korea at a time when Pyongyang is trying to reopen part of its airspace to foreign flights, three sources familiar with the matter have told Reuters.
The U.S. move is part of a negotiating tactic to maintain sanctions pressure on North Korea, one of the sources said, ahead of a second summit between President Donald Trump and leader Kim Jong Un in Vietnam in late February.
Washington is seeking concrete commitments from Pyongyang at the summit to abandon its nuclear and missile programs.
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