At this point I don’t know why Russia would want to disguise North Korea’s Soldiers. Everyone knows they are there:

A group of North Korean soldiers disguised as “indigenous people” of Russia’s Far East have engaged in combat with Ukrainian troops in Russia’s western border region of Kursk, according to a Ukraine news report.
Citing Kyiv’s top military officer, RBC Ukraine on Sunday (local time) reported that more than 11,000 North Korean soldiers are already stationed in the Kursk region and have take part in battles against Ukrainian troops.
“These are mostly general military units. They are disguised as indigenous people of the Far East. They have the appropriate documents,” Anatolii Barhylevych, the chief of the General Staff of the Armed Forces of Ukraine, was quoted as saying.
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