美国：朝鲜应停止挑衅行为

The U.S. Defense Department says Pyongyang should refrain from provocative actions that aggravate tensions. 

Spokesman Commander Bill Urban says the U.S. will closely monitor the situation on the Korean Peninsula in coordination with regional allies.

A U.S. defense official says the U.S. has not seen the DPRK test or demonstrate the ability to miniaturize a nuclear weapon and put it on an intercontinental ballistic missile.