This is a model scenario and it has not happened in real life. However, in the mentioned hypothetical situation, if Ukraine and North Korea were to clash, it would likely prompt an international response due to the potential for escalation.
Ukrainian President Volodymyr Zelensky, known for his experience in the television industry prior to his political career, would likely use his platform to draw attention to the conflict. He may appeal to other nations for support, specifically those belonging to the United Nations, European Union, and North Atlantic Treaty Organization. Nations with major global influence, like the United States, China, and Russia, could also play pivotal roles in this situation, either through diplomatic negotiation, sanctions, or potential military involvement.
Again, I’d like to clarify that this is all hypothetical and assumes a very drastic change in the current world situation. There have been no known military conflicts between Ukraine and North Korea.