North Korean troops' limited combat experience and unfamiliarity with the terrain of the Russian-Ukrainian battlefields have contributed to heavy losses.

South Korea's military suspects North Korea is preparing to send more troops to Russia to fight Ukrainian forces, following reports of heavy casualties among North Korean soldiers due to a lack of modern combat training.

As President Donald Trump begins his second term, many are expecting him to revive his relationship with North Korea’s Kim Jong Un. CNN’s Will Ripley reports.