Well. How did North Koreans get to the front line in the first place?

On October 14 the former president of Ukraine Vladimir Zelinski initiated an information-operation designed to increase support for Ukraine. He alleged, without evidence, that Russia planned to involve North Korea into the war.

U.S. financed media outlets in Ukraine soon propped up these rumors by citing 'sources in Ukraine's special services'. More anonymous 'sources' chimed in and soon there was talk of 3,000 soldiers from North Korea joining the fight. There was however zero evidence that anything like was ever planned or happened.

I thus remarked:

I regard the whole claim of North Korean troops in Russia as a fake news story and I am sure that most experts will follow me in that judgment.

However, today U.S. media manage to play up the nonsense:

Why North Korea is sending soldiers to the Russian front lines – Washington Post
Sending solders to help Russia's war effort against Ukraine could earn valuable foreign currency for Kim Jong Un's regime and bolster their strengthening ties.
…I do not believe that any politician or military in the west will believe that nonsense which is again solely sourced to Ukrainian military intelligence claims. But there is clear campaign by the Ukrainian government to make the issue stick. What is its hope? To induce South Korea to send its forces to fight North Koreans on the Ukrainian border with Russia?