ABOARD AIR FORCE ONE (Reuters) – The United States, Japan and South Korea will have a coordinated response if North Korea carries out a seventh nuclear test, White House national security adviser Jake Sullivan said on Sunday as President Joe Biden traveled to the G20 summit in Indonesia. Sullivan, speaking to reporters aboard Air Force One, also reiterated that Pyongyang’s nuclear test would be a “flagrant violation” of multiple United Nation Security council resolutions. (Reporting by Nandita Bose and Andrea Shalal; writing by Susan Heavey;Editing by Elaine Hardcastle)