What do North Korean troop deployments to Russia mean for geopolitics?

In early October, Ukrainian intelligence reported that several thousand North Korean soldiers were undergoing training in Russia in preparation for deployment to the Ukrainian front line later this year. South Korea's National Intelligence Service (NIS) later corroborated Ukraine's assertions, sharing satellite images of Russian vessels transporting the first batch of 1,500 North Korean special forces to Russia's Far East. On October 23, White House National Security Communications Advisor John Kirby confirmed the presence of at least 3,000 soldiers. The Pentagon now believes that 10,000 North Korean troops are in Russia with a contingent heading toward the Kursk region in western Russia to battle Ukrainian forces.