And the spread of nuclear weapons to more states is also an unacceptable risk to global security — raising the specter of arms RACES from the Middle East to East Asia.

核武器扩散到更多的国家也对全球安全构成了不可接受的威胁——在从中东到东亚各地引起对军备竞赛的担忧。

youdao

China is the only one among the five nuclear powers to publicly declare no first use of nuclear weapons and no use of nuclear weapons against non-nuclear states.

中国是五个核大国中唯一一个公开宣布不首先使用核武器，不对无核国家使用核武器的国家。

youdao

There is still some doubt how comprehensive this treaty will be, since some of the nuclear-weapons states hold out for permitting a threshold of small explosions (equal to 500 tons of TNT or less).

CNN: ASIANOW - Asiaweek

Mr Obama wants to show he is honouring the central bargain of the treaty: that the five nuclear-weapons states would disarm in return for a vow by other countries not to seek nuclear weapons.

ECONOMIST: Disarmament and counter-proliferation

Since then, the five acknowledged nuclear-weapons states - Russia, the U.S., France, China and Britain - have conducted more than a thousand tests, from the Australian desert (Britain in the 1950s) and the frozen wastes of Siberia's Novaya Zemlya to subterranean Polynesia, where on Sept. 5 France began its latest series of tests at Mururoa Atoll.

CNN: ASIANOW - Asiaweek