Rich Edson reports from the State Department on their response to Pyongyang's latest threat.
North Korea fired three unidentified projectiles off its east coast early Monday, according to South Korea's military, amid a deadlock in a U.S.-led diplomacy aimed at stripping the rogue nation of its nuclear weapons.
The statement said South Korea’s military was monitoring North Korea for possible additional launches.
In recent days, North Korea said leader Kim Jong Un supervised two rounds of live-fire artillery exercises in its first weapons tests since late November.
South Korea and some European countries protested against the launches, and the North has lashed out at it saying it has the sovereignty rights to conduct military drills.
Kim had entered the new year vowing to bolster his nuclear deterrent in the face of what his regime called “gangster-like” U.S. sanctions and pressure.
The Associated Press contributed to this report.