It is not a fucking shooting war. South Korea is not going to send over their entire stockpile. And also, the North Korean military is so weak compared to the South Korean one that if it does turn into a shooting war, it will end badly for both sides. Cause North Korea would have to resort to nukes to even stand a chance and the South Korean military will dominate the North Korean one in a similar fashion to how the Iraqis got dominated in the gulf wars.

Do more research into the industrial capability of South Korea. It is precisely the fact they had to maintain industry that can easily ramp up for war production makes them ideal suppliers for the Ukrainian military.