North Korean leader Kim Jong Un supervised drills by the nation's air force and underscored the need for a step-up in war preparation, state media said on Saturday.

Axar.az reports, citing Reuters, Kim, who inspected anti-aircraft combat and airstrike drills by North Korea's 1st Air Division on Thursday, called for "all units in the entire military" to bring about "a breakthrough in war preparation," the official Korean Central News Agency reported.

Footage of the drills on North Korean state TV showed a MiG-29 jet launching a missile, which appeared to be a North Korean version of a Russia-developed mid- to long-range air-to-air missile, said Hong Min, North Korea analyst at the Korea Institute for National Unification.