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.
Venezuela quake death toll nears 3,000 as rescue effort winds down
Eight injured in New York shooting
Trump appears on National Mall for July 4 speech after storm-related delay
Qatar says all maritime activities will resume immediately
St. Petersburg region port, oil terminal hit in Ukrainian drone attack
