South Korea

This isn’t a war crime — you may be thinking of the war crime of transporting military personnel in vehicles with medical markings (red cross, etc)

If your country is big enough, you can commit war crimes openly and get away with it. I hope that changes.

Ukraine also uses many civilian-sourced vehicles, including for moving troops. It is not inherently a war crime. It is frankly necessary when both sides are losing vehicles to enemy action constantly.