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.
At least 14 killed in explosion at weapons depot in Syria
US hits five Iranian oil tankers after attack on Navy ships
UK gives air traffic provider a week to probe outage that halted flights
Serbia's President Vucic dissolves parliament, calls snap elections
With large crowds attending, Norway lays King Harald to rest
Jordan intercepts 18 Iranian ballistic missiles
Air traffic control issue disrupts flights at major UK airports
At least 73 injured after Houthi rebels attack Saudi civilian and energy facilities
