Kim Jong Un supervised a ballistic missile launch exercise by the Hwasong artillery units of the Strategic Force of the Korean People's Army (KPA), commissioned with a test strike against the U.S. military base in Japan, state-run Korean Central News Agency (KCNA) reported on Tuesday.North Korea launched a salvo of four missiles towards the Sea of Japan (known in Korea as the East Sea) on Monday morning, South Korea’s Joint Chiefs of Staff (JCS) confirmed on Monday.Three landed within Japan’s exclusive economic zone (EEZ), with the missiles flying around 1,000 kilometers before splashing down within Japan