After landing at the site in an air force fighter jet, South Korean President Moon Jae-in told a military expo in the outskirts of Seoul on Wednesday that the nation should redouble its efforts to become a global defense industry leader.

Clad in a flight suit, Moon arrived at the biennial Seoul International Aerospace & Defense Exhibition (ADEX) in the back seat of an FA-50 jet fighter, South Korea's first indigenous supersonic aircraft and a major defense export.

The military display came a day after North Korea test fired a ballistic missile from a submarine. Last week North Korea opened a defense exhibition of its own, where leader Kim Jong Un said his country's military developments were for self-defense and accused South Korea of destabilizing the peninsula with an arms build up.