Pyongyang regularly criticizes such drills as rehearsals for invasion and sometimes responds with weapons tests, but Seoul and Washington say they are purely defensive.

North Korea's Kim Yo Jong, the powerful sister of leader Kim Jong Un, said South Korea and its President Lee Jae Myung had a "dual personality" by talking about wanting to pursue peace while continuing joint military drills with the U.

Kim said the "security environment" around North Korea is "getting more serious day by day" and "requires us to make a radical and swift change in the existing military theory and practice and rapid expansion of nuclearization," the official Rodong Sinmun newspaper reported, paraphrasing his remarks.