North Korean leader Kim Jong-Un oversaw the test of a "super-large multiple rocket launcher" over the weekend.
Making the announcement on Sunday, the state news agency KCNA released photos showing rockets launching from large tubes mounted on the back of an eight-wheel vehicle.
Applauding North Korea's young defence scientists who developed the missiles, Kim called them a "precious treasure and wealth of the country which cannot be bartered for anything."
On Saturday, a KCNA commentary said North Korea "will never barter the strategic security of the country for the sanctions relief."
It's the latest in a series of launches in recent weeks amid stalled denuclearisation talks.
Israel-Iran battle escalates, civilians urged to evacuate target areas
US police arrest suspect in Minnesota lawmakers' shooting
Trump calls for expanded deportation efforts of people illegally in US
Israel and Iran strike at each other in new wave of attacks
2 killed, several swept away after bridge collapses in India's Pune
Gunman who shot 2 US lawmakers still at large as manhunt continues
Israeli fire kills 12 people in Gaza, medics say
Helicopter crashes in northern Indian state, 6 people on board
