Two U.S. supersonic bombers have flown over the Korean Peninsula in bombing exercises that are also a show of force against North Korea ahead of President Donald Trump's first official visit to Asia.

A South Korean military official said Friday the B-1B bombers flown from Guam were escorted by two South Korean F-16 fighter jets during the drills Thursday at a field near the South's eastern coast. The official did not want to be named, citing office rules.

North Korea's state media denounced the exercise as a "surprise nuclear strike drill" and says "gangster-like U.S. imperialists" are seeking to ignite a nuclear war.

The United States has been sending its strategic assets to the region more frequently for patrols or drills as North Korea further advances its nuclear weapons program.