South Korea's Moon Jae-in (left) with Donald Trump. File Pic

South Korea's President Moon Jae-in said on Monday there could be more impromptu talks with North Korea including summits between pre-arranged dialogue. "If we could hold working-level, back-to-back talks on both sides of Panmunjom if urgently necessary in addition to formal summits, it would expedite faster advancement of inter-Korean relations," Moon said.