Kim Jong Un poses with scientists and engineers from a defence science research institute at an event. AFP

Kim also handed promotions to more than 100 officials and scientists for their work on the Hwasong-17 — dubbed the "monster missile" by analysts and believed to be capable of reaching the US mainland — just days after Pyongyang test-fired it in one of its most powerful launches yet.

Hailing the new ICBM as "the world's strongest strategic weapon", Kim said North Korean scientists had made a "wonderful leap forward in the development of the technology of mounting nuclear warheads on ballistic missiles", the official Korean Central News Agency (KCNA) reported.

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Building the nuclear force to protect the dignity and sovereignty of the state and the people "is the greatest and most important revolutionary cause, and its ultimate goal is to possess the world's most powerful strategic force, the absolute force unprecedented in the century", Kim was quoted as saying in his order promoting the officials.

The leading officials and scientists had demonstrated to the world Pyongyang's "goal of building the world's strongest army", he added.

Kim Jong Un and his daughter pose with soldiers at an unknown location in North Korea. AFP

The launching vehicle for the new Hwasong-17 ICBM was awarded the title of "DPRK Hero", a separate KCNA report said, using the initials for the North's official name.

It "clearly proved before the world that the DPRK is a full-fledged nuclear power", the report said, adding the North "fully demonstrated its might as the most powerful ICBM state".

Hong Min of the Korea Institute for National Unification said the North's trumpeting of the Hwasong-17's test-firing was aimed at elevating its status as a nuclear power.

"If the (launch of the) Hwasong-15 in 2017 was focused on becoming a nation that can threaten the US mainland with nukes, the latest missile is focusing on becoming the most powerful ICBM state," he said.

The UN Security Council has passed nearly a dozen resolutions imposing sanctions on North Korea over its nuclear and missile activity since 2006.

Agence France-Presse