Any violation that detracts from the world's goal of finally fully denuclearizing North Korea would be something that America would take very seriously.
It follows an interview where Mike Pompeo said the Trump administration would maintain strict economic sanctions on North Korea unless it made efforts to denuclearize.
The international community is looking for concrete actions from Pyongyang to comply with its international obligations and abide by its commitments, including to denuclearize.
But Mike Pompeo, his Secretary of State says Kim has given him a personal assurance that he is willing to denuclearize although offering no details on when or how.