Russia launched a massive attack on Ukraine’s energy grid, leaving many in the country in the dark over the holiday. Retired Col. Jack Jacobs shares his thoughts about recent developments in Ukraine and a potential twist in North Korea’s involvement.

North Korean troops are suffering heavy losses in the fighting in Russia's Kursk region and are facing logistical difficulties as a result of Ukrainian attacks, Ukraine’s military intelligence said Thursday.

North Korean troops have now entered Russia’s war with Ukraine in a major way, and some have been killed, Western officials say.