Ukraine’s President Volodymyr Zelensky said Friday that several “seriously wounded” North Korean soldiers died from their injuries after being captured by Ukrainian forces.

Russia is deploying “human waves” of North Korean soldiers, the U.S. said, and one soldier captured by Ukraine died of his injuries. Others died by suicide.

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.