North Korea has completed preparations for another nuclear test, South Korea's Yonhap News Agency reported on Monday, citing South Korean government sources who said the North may use a previously unused tunnel at its mountainous test site.
The United States may launch unilateral sanctions against North Korea, a US special envoy for the isolated state said on Sunday, two days after it carried out its fifth and biggest nuclear test in defiance of UN sanctions.
North Korea conducted its fifth and biggest nuclear test on Friday and said it had mastered the ability to mount a warhead on a ballistic missile, ratcheting up a threat that rivals and the United Nations have been powerless to contain.
North Korea is "likely" to have conducted a nuclear test on Wednesday that caused an earthquake near a known testing site in the isolated country, the South Korean and Japanese governments said.
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Six world powers demanded Iran keep its promise to let international inspectors visit a military installation where the UN nuclear watchdog believes explosives tests geared to developing atomic bombs may have taken place.
The joint call w