North Korea has criticised a practice bombing run on the Korean peninsula by two US B-1B bombers as a dangerous move, raising the risk of nuclear war.
A commentary today in the ruling party's Rodong Sinmun newspaper accused the US of "reckless military provocations" that are escalating tensions.
The US Air Force bombers released inert weapons on Friday on a training range in South Korea.
South Korean and US fighter jets joined the drill. The bombers also flew with Japanese fighter jets on their way back to Andersen Air Force Base in Guam.
The 10-hour mission came three days after North Korea tested an intercontinental ballistic missile.
US military officials described the exercise as a defensive show of force and unity that demonstrated "the iron-clad US commitment to our allies".