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South Korea's top security adviser said Friday that Seoul will continue taking necessary measures based on 'clear principles' in response to the recent mine blast in the Demilitarized Zone (DMZ) that seriously injured three people, according to Yonhap and the Korea Times. The presidential office reiterated this stance, and President Lee Jae Myung separately vowed to strengthen the South Korea-U.S. alliance. North Korea has called Seoul's claim of an armistice violation a 'fabrication' and sent a letter to the UN Security Council, while South Korean military authorities estimate Pyongyang has laid about 960,000 new mines in the area over the past two years, Business Korea reports. Korean media coverage focuses on the government's firm but unspecified 'necessary measures,' with Yonhap and KBS World leading the reports; no blog or café reactions were included in the supplied material.