assuming the western media isn't just completely full of shit and there are actually north korean soldiers in russia / ukraine - which is a big assumption - i imagine what's actually going on is that the norks just want the warfighting experience, rather than the highly improbable notion that "russia is so short of troops that they need to bring in the gooks". i could see it being recompense for their sourcing materiel from nk, i.e. > we'll give you these shells and missiles, but in exchange you need to take a brigade or two of ours and put them in the game so we can shake the cobwebs off our military and brush them up on modern warfare
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