South Korean authorities seize a vessel at Pyeongtaek-Dangjin port on suspicion of transferring oil products to North Korea, customs official says.
Japanese fighters conduct joint air drills with US supersonic bombers close to the Korean peninsula as reports emerge of Pyongyang miniaturising a nuclear warhead.
The sanctions, imposed by the UN Security Council, would strip the country of more than $700 million.
The latest missile test has alarmed Tokyo, which has expressed its outrage, while also ramping up tensions with South Korea and the United States.
Japan says tests proof of intensifying threats; South Korea's Foreign Ministry warns North Korea may face even stronger sanctions.
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