This was said after North Korea floated propaganda leaflets to South Korea that threatened the annihilation of Baengnyeongdo.
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Later, the Geophysical Service of the Russian Academy of Sciences did not register any seismic events and underground tremors at 16:00 local time on 12 February 2013, in the Russian Far East.
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Before North Korea announced they had conducted the test, seismic activity had already been detected in North Korea by the USGS, near the site of previous nuclear tests at Mantapsan in Kilju County.
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Following North Korea's testing of nuclear weapons in 2006, 2009 and 2013, and the testing of a ballistic missile in 2012, the United Nations Security Council unanimously adopted resolutions 1718, 1874, 2087 and 2094.