Boris Johnson has said the regime of Kim Jong Un is responsible for the crisis over North Korea's nuclear programme and must now "fix it".
In a series of posting on his Twitter feed, the Foreign Secretary said Britain was working with the United States and allies in the region to find a diplomatic solution to the stand-off between Pyongyang and Washington.
"The North Korean regime is the cause of this problem and they must fix it ," he said.
"The international community is shoulder to shoulder in ensuring North Korea stops its aggressive acts.
"We are working with the US and our partners in the region to bring this crisis to a diplomatic end."