North Korea’s artillery forces “will turn Seoul into rubble and ashes” if “the enemies challenge us [Pyongyang],” North Korea’s Central News Agency (KCNA) quoted Kim Jong Un as saying on Friday, when the North Korean leader was overseeing a large artillery drill.

North Korean leader Kim Jong Un uses a pair of binoculars to watch live ammunition firing drills.

According to KCNA, the military exercise involved a simulated strike on the governing bodies in Seoul as well as the Blue House, the executive office and official residence of the South Korean head of state.

North Korea’s threats against Seoul come as the maritime portion of the annual Foal Eagle military exercises between South Korean and US forces began on Thursday. Foal Eagle is a series of joint and combined field training exercises conducted by US-South Korea Combined Forces Command each year.

As in past years, North Korea responded to the beginning of Foal Eagle with a threat to annihilate its enemies with nuclear weapons.