In short:
The revelation of a transfer to South Korea of two North Koreans caught fighting for Russia has sparked calls for a full apology.
Seoul has accused Ukraine of making the announcement in breach of a non-disclosure agreement regarding prisoner of war transfers.
Kyiv says it has only stated the fact of their transfer.
They also pissed off Poland recently by naming an army unit after Ukrainian Nazi collaborators.
https://en.wikipedia.org/wiki/Massacres_of_Poles_in_Volhynia_and_Eastern_Galicia
https://en.wikipedia.org/wiki/2026_Poland–Ukraine_diplomatic_crisis
Yikes 😬
I mean, at least that one was explicable - an attempt to pacify the domestic far-right in Ukraine. Dumb and reprehensible, but explicable. Pissing off the South Koreans seems like just shooting yourself in the foot for no reason at all.