The United States on Monday condemned a series of missile launches by North Korea as a threat to its allies and civilian air travel, vowing diplomatic action against the Pyongyang regime. 

"Today’s reckless launches by North Korea pose threats to civil aviation and maritime commerce in the region," said a senior administration official. 

The official, speaking on the sidelines of the G20 summit in China, said Washington would look to "bolster international resolve to hold the DPRK (North Korea)accountable for its provocative actions".