South Korea will closely coordinate with the United States to make sure a resumption of dialogue between Washington and Pyongyang will lead to tangible progress on the North Korean nuclear issue, Seoul's top security adviser said Friday. National Security Adviser Wi Sung-lac made the remarks at a press briefing as U.S. President Donald Trump has repeatedly signaled his intention to rekindle now-dormant diplomacy with North Korean leader Kim Jong-un. Trump's dialogue offer, at a time when North Korea has significantly advanced its nuclear and missile capabilities, is stirring concerns that renewed talks could come at the cost of compromising the allies' long-held goal of completely denuclearizing the North. Wi stressed that Seoul should focus on "cooperation with the U.S. in a way that the resumption of North Korea-U.S. dialogue could lead to tangible progress toward the establishment of a peace regime on the Korean Peninsula and (resolving) the North Korean nuclear issue." "(The government) plans to help build trust between North Korea and the U.S. so that President Trump's efforts can l