Read this –

Japan’s coast guard earlier said North Korea launched a projectile which landed inside Japan’s exclusive economic zone (EEZ), 170 km (106 miles) west of Aomori prefecture in northern Japan, at 3.44 pm (6.44am GMT).The launch by North Korea is thought to be its biggest test ever, militaries in South Korea and Japan said.

The South Korean military conducted a live-fire test of multiple ballistic and tactical missiles in what it called an immediate response.They said they were ready and capable of precision strikes against the location where North Korea launched its missile, if needed.

I warned us of this on March 11^th. I suggest you read what I put there.