South Korea tells Russia's ambassador they are prepared to respond with "all measures available".
South Korea has summoned the Russian ambassador, seeking the "immediate withdrawal" of North Korean troops which it says are being trained to fight in Ukraine.
About 1,500 North Korean soldiers, including those from the special forces, have already arrived in Russia, according to Seoul's spy agency.
In a meeting with the ambassador Georgiy Zinoviev, South Korea's vice-foreign minister Kim Hong-kyun denounced the move and warned that Seoul will "respond with all measures available".
I would think that fewer DPRK soldiers on the Korean peninsula, and more or them defecting, captured, wounded, or killed in Ukraine would be good for South Korea.
I think DPRK's hope is that at least some soldiers and officers will return with some modern combat experience, something that their military organization is dreadfully lacking. It could end up being a bigger problem down the road for ROK even if they lose a few thousand bodies.
South Korea prides themselves on threatening to destroy the relatively hostage North. The north can't do anything without the South's approval, or it gets wiped out.
It's not about practicality or safety, it's purely about punishing the north for wanting freedom.