US Vice President Kamala Harris visited the Demilitarised Zone (DMZ) dividing the Koreas before concluding her four-day Asia trip. Earlier, Harris met South Korean President Yoon Suk-yeol and reaffirmed the US commitment to defend the country with military capabilities in the event of war, Yoon Suk-yeol's office said. North Korea fired two short-range ballistic missiles over the last week.