Even with THAAD defence, North Korea missile barrage poses threat to South

FILE PHOTO: North Korean leader Kim Jong Un supervised a ballistic rocket launching drill of Hwasong artillery units of the Strategic Force of the KPA on the spot in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang March 7, 2017.

SEOUL (Reuters) - North Korea's latest weapons test showed it can accurately fire multiple medium-range ballistic missiles, an attack strategy that experts said could test the advanced U.S. THAAD anti-missile system which began to arrive in South Korea on Tuesday.

Advances in North Korea's banned missile programme have also caused concern in Tokyo, where sources with knowledge of the government's thinking said a "swarm-like" attack using multiple missiles could overwhelm Japan's already stretched defences.