Foreign Secretary Boris Johnson has told North Korea it must adhere to UN resolutions in order to secure peace.
As international tension heightened over the country's nuclear weapons programme in the face of fierce American criticism of the Pyongyang regime, Mr Johnson said the situation needed to be looked at carefully.
"We have been here before but continue to monitor the situation carefully.
"We stand alongside our international partners in making clear that North Korea must adhere to UN resolutions designed to secure peace and stability in the region and stop its pursuit of nuclear weapons," he said.