https://simplicius76.substack.com/p/russian-general-staff-confirms-north

I now wonder if those who ran this were savvy enough to place them together with Siberian troops. It’s not clear from the text.

There are no North Korean troops in Russia, and not one of them ever fought in Kursk.

Heh. There were mentions initially from AFU, that seemed to be an excuse. https://simplicius76.substack.com/p/sitrep-111124-ukraine-scrambles-for
And then repeated by the circus. https://simplicius76.substack.com/p/fourth-estate-begins-conditioning
Probably of all NK involvement, only the reports of Bulsae-4 were true. In that a deal with allies for field testing of hardware that does not have a local equivalent makes sense.

After the mutual defense treaty was signed a small number of North Koreans did some orientation training at Vladivostok.

Shiryaev has discredited himself by repeating that lie.