Ukraine

Well if you’re aiming for the North Korean border as the original post suggested then you’re likely targeting railroad infrastructure. To get to the NK border you have to go a long roundabout route to avoid encroaching on Chinese airspace. Taking out train choke points even half way closer to Ukraine would be a lot easier, and still cause a lot of disruption of supplies from NK. I’m sure there are plenty of bridges, tunnels, etc. that could be targeted.