North Korean leader Kim Jong Un watched an extreme martial arts demonstration by soldiers at a military event marking the 76th founding anniversary of its ruling party, state media reported on Tuesday, October 12.

In the video aired by the North’s state-run television KRT, soldiers performed multiple shows of strength, smashing items, breaking free from chains, lying on glass and throwing knives.

Kim smiled and clapped as he watched the show at the Defence Development Exhibition “Self-Defence-2021” held on Monday, October 11.

During the exhibition, Kim said his country’s weapons development is necessary in the face of hostile policies from the United States and a military buildup in South Korea, according to state media.