North Korea claims to have successfully tested a missile capable of carrying multiple warheads, according to state media reports on Thursday, although these were dismissed by South Korea as deceptive and exaggerated. Pyongyang’s state-controlled KCNA news agency spoke of a successful test for a “new important technology.” But a spokesman for the South Korean Joint Chiefs of Staff told journalists in Seoul that the test missile, fired by North Korea the day before, had exploded in the early phase of the flight. Widely isolated North Korea, under the rule of Kim Jong Un, is subject to internatio…