"We are worried about the sharp rhetoric from North Korea. I understand that it is a reaction against the resolution that is now with the United Nations' Security Council. But the resolution is a natural response to the nuclear test North Korea carried out, which was a direct challenge to the international community," Bildt tells Swedish Radio.
The foreign minister added that it is "hard to judge" whether the threat should be taken seriously. "We have seen it several times, North Korea has a tendency to use very strong and escalated rhetoric."