The South Korean and US militaries conducted large live-fire drills near the border with North Korea on Thursday, despite the North’s warning that it won’t tolerate “an invasion rehearsal on its doorstep”.

The drills—the first of five rounds of live-fire exercises through mid-June—mark 70 years since the establishment of the military alliance between Seoul and Washington. North Korea typically reacts to such major South Korean-US exercises with missile and other weapons tests.