Lloyd Austin, U.S. secretary of defense, visits the National Cemetery in Seoul, South Korea, on Thursday. On his Asia tour, the defense chief made an unannounced visit to Afghanistan on Sunday.

Lloyd Austin, U.S. secretary of defense, visits the National Cemetery in Seoul, South Korea, on Thursday, March 18, 2021. North Korea ruled out further talks with the U.S. for now, as Kim Jong Un’s regime sought to raise pressure on top Biden administration officials visiting Seoul. Photographer: SeongJoon Cho/Bloomberg via Getty Images