South Korea’s military launched a volley of ballistic missiles simulating an attack on the North’s nuclear test site Monday as the US warned it could launch a “massive military response” to threats from Pyongyang amid efforts by Japan to defend itself.

In an exercise responding to a test of what Pyongyang says was a hydrogen bomb, South Korean short-range Hyunmoo ballistic missiles roared into the sky in the pale light of dawn from a launch site on the country’s east coast.

Authorities released video showing South Korean F-15K fighter jets firing air-to-ground missiles.

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