Pyongyang, North Korea - North Korea showed off its "most powerful" intercontinental ballistic missile at a military parade attended by top officials from Russia and China, Pyongyang's state media reported Saturday.

The event to mark 80 years under the ruling Workers' Party came as leader Kim Jong-un has been emboldened by the war in Ukraine, securing critical support from Russia after sending thousands of North Korean troops to fight alongside Moscow's forces.

Dmitry Medvedev, deputy head of Russia's Security Council and a close ally of President Vladimir Putin, attended the parade Friday alongside Chinese Premier Li Qiang and Vietnam's leader To Lam – all seated near Kim, according to images released by the official Korean Central News Agency.

The spectacle featured some of the country's most advanced weapons, including its new Hwasong-20 intercontinental ballistic missile, which KCNA described as its "most powerful nuclear strategic weapon system".

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Thousands of people in colorful traditional dress filled the streets of the North Korean capital for the late-night event, the images showed, waving national flags and cheering as weapons rumbled down the main streets.

Among the featured weapons, long-range strategic cruise missiles, drone launch vehicles, and ground-to-air and ground-to-ground missiles paraded one after another, KCNA added.

During his address, Kim gave an apparent nod to North Korean troops fighting alongside Moscow's forces in Russia's war against Ukraine.

"The heroic fighting spirit displayed, and the victory achieved, by our revolutionary armed forces on the foreign battlefields for international justice ... demonstrated the ideological and spiritual perfection," he said, according to KCNA.

Around 600 North Korean soldiers have been killed and thousands more wounded fighting for Russia, South Korea has claimed.

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The parade displayed the isolated, nuclear-armed country's "inexhaustible defense technology potential and its astonishing pace of development that the world can no longer ignore", KCNA said.

The celebrations in Pyongyang come after Seoul said a meeting between North Korea and the US "cannot be ruled out" on the sidelines of this year's APEC summit in South Korea.

President Donald Trump met Kim three times during his first term and once said the pair had fallen "in love", but he ultimately failed to secure a lasting agreement on North Korea's nuclear program.

Since then Pyongyang has repeatedly declared itself an "irreversible" nuclear state.