North Korea tests solid-fuel motor, aiming to build new weapon: state media

North Korea has successfully tested a "high-thrust solid-fuel motor" with the aim of developing a new weapon, state media said Friday.

Despite heavy international sanctions over its weapons programmes, Pyongyang has built up an arsenal of intercontinental ballistic missiles (ICBMs).

All its known ICBMs are liquid-fuelled, however, and North Korean leader Kim Jong Un said last year that developing solid-fuel engines for more advanced missiles was a strategic priority.

On Thursday, he oversaw the successful test fire of a "high-thrust solid-fuel motor", the official Korean Central News Agency (KCNA) reported.

KCNA described it as an important test "for the development of another new-type strategic weapon system".

Images released by state media showed Kim observing the test at the Sohae Satellite Launch Ground, as the horizontally placed motor spewed bright yellow exhaust flame.

Another image showed him grinning with a lit cigarette in his hand and a tower of white smoke from the test behind him.

Liquid-fuel rockets are notoriously difficult to operate and take a long time to prepare for launch, analysts say.

They are thus slower, and easier for an enemy to spot and destroy.

Solid-fuel missiles are "more mobile, quicker to launch, and easier to conceal and use during a conflict," said Leif-Eric Easley, a professor at Ewha University in Seoul.

"Once deployed, the technology would make North Korea's nuclear forces more versatile, survivable and dangerous."

Kim said this year that he wants North Korea to have the world's most powerful nuclear force, and declared his country an "irreversible" nuclear state.

The wishlist he revealed last year included solid-fuel ICBMs that could be launched from land or submarines.

The latest motor test was a step towards that goal, but it is not clear how far North Korea has come in the development of such a missile, analysts said.

It is "difficult to assess the thrust output claimed by North Korea," Joseph Dempsey, a researcher at the International Institute for Strategic Studies (IISS), told AFP.

"What other technical challenges remain and how far away a flight test of such a system is remains unknown," he added.

Pyongyang has conducted an unprecedented wave of weapons tests this year, including the firing of its most advanced ICBM.

The United States and South Korea have warned for months that North Korea is possibly preparing to conduct its seventh nuclear test.

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