CNN reports that “the US and South Korean navies put on a show of force in the Sea of Japan on Monday, the latest in a string of displays of military might in response to North Korea’s testing of nuclear warheads and ballistic missiles.”

“Monday’s exercises saw the US guided missile destroyer USS Spruance join ships, submarines and planes from the South Korean navy in waters east of the Korean Peninsula.”

“But during the joint drill, a South Korean helicopter with three people on board crashed into the sea, according to South Korea’s Navy.”