The law of unintended consequences.
Watch Russia downplay North Korean involvement in the war, after it emerges that South Korea are considering getting involved.
I understand they have a lot of shells. A lot. The Miami Herald puts it at 3.4 million - one result of living next door to North Korea for 70 odd years.
But now South Korea MUST provide the shells... else it'll be more weakness (just words of condemnation)from the 'west' .