The launch happened hours after South Korean and U.S. troops kicked off their large annual combined drills, which the North views as an invasion rehearsal.
South Korean and U.S. militaries halted all live-fire exercises across South Korea after South Korean jets mistakenly released bombs on a civilian area.
A suspected senior planner in the suicide bombing at the Kabul airport that killed 13 American troops will appear Wednesday in federal court in the U.S.