This year’s observance of the International Day Against Nuclear Tests marks the twentieth anniversary of the closure of the nuclear weapons test site at Semipalatinsk, Kazakhstan.

今年禁止核试验国际日正值哈萨克斯坦塞米巴拉金斯克核武器试验场关闭20周年。

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They and the European Union say it will violate a U.N.resolution imposed after North Korea conducted at 2006 nuclear weapons test.

VOA: standard.2009.04.01

The Security Council resolution was put in place after North Korea' first nuclear weapons test and the launch of a ballistic missile.

VOA: standard.2009.04.03

For weeks, South Korean officials delayed expected announcements it would join, but experts say they had no other choice after Monday's underground nuclear weapons test by the North.

VOA: standard.2009.05.26

Just weeks after Mr. Obama took office, North Korea conducted its second nuclear weapons test.

WSJ: U.S., South Korea Offer North Talks, and a Warning

He suggests a recommitment by the nuclear powers not to test their weapons--there have been no nuclear tests since 1996--in exchange for a commitment by all nations to stop enriching uranium.

NPR: Nuclear Weapons Gain Importance for Regional Powers

For instance, one reason Washington is often surprised when countries like Pakistan test nuclear weapons is that other governments have a good idea what times of the day they are within range of U.S. photo-reconnaissance satellites, and so they conduct sensitive operations while the satellites are out of range.

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