SEOUL, June 22 (Reuters) - North Korea launched what appeared to be a second intermediate-range Musudan missile on Wednesday that flew about 400 km (250 miles), in what appeared to be its most effective test yet, hours after another launch failed, South Korea's military said.
It was not immediately clear if the second Musudan launch, about two hours after the first, was considered a success or failure, or how the flight ended. However, the distance it covered was theoretically more than halfway towards the southwest coast of Japan's main Honshu island.
[caption id="attachment_202758" align="aligncenter" width="800"]
An underwater test-fire of strategic submarine ballistic missile is pictured in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on April 24, 2016. KCNA/via REUTERS/File Photo[/caption]
The first missile was launched from the east coast city of Wonsan, a South Korean official said, the same area where previous tests of intermediate-range missiles were conducted, possibly using mobile launchers.
Japan's Defense Minister Gen Nakatani reacts as he speaks to the media at the Defense Ministry in Tokyo, Japan June 22, 2016. REUTERS/Toru Hanai[/caption]
Japan put its military on alert on Tuesday for a possible North Korean ballistic missile launch. South Korea's Yonhap News Agency, citing an unidentified government source, said the North had been seen moving an intermediate-range missile to its east coast.
North Korea is believed to have up to 30 Musudan missiles, according to South Korean media, which officials said were first deployed around 2007, although the North had never attempted to test-fire them until April.
The U.N. Security Council, backed by the North's main diplomatic ally, China, imposed tough new sanctions in March after the isolated state conducted its fourth nuclear test in January and launched a long-range rocket that put an object into space orbit.
North Korea has conducted a series of tests since then that it claimed showed progress in nuclear weapons and long-range ballistic missile capabilities, including new rocket engines and simulated atmospheric re-entry.
The two Koreas technically remain in a state of war after the 1950-53 Korean War ended in an armistice, not a peace treaty.
A spokesman for South Korea's Unification Ministry said North Korea should channel its efforts into the welfare of its people and peace on the Korean peninsula rather than developing its missile technology.