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The New Nuclear Era

For many years, scholars and officials have believed that the nuclear problem was a relic of the Cold War. To the contrary, the world is moving closer to a new era that could be defined even more sharply by nuclear weapons, as Vladimir Putin’s threats against Ukraine demonstrate.

NEW YORK – Nuclear weapons have been a feature of international relations since August 1945, when the United States dropped two of them on Japan to hasten the end of World War II. None has been used since then, and they arguably helped keep the Cold War cold by forcing a degree of caution on both sides of the confrontation between the US and the Soviet Union. Moreover, arms-control negotiations succeeded in limiting both countries’ nuclear arsenals and stopped or slowed nuclear proliferation. Today, only seven other countries (the United Kingdom, France, China, Israel, India, Pakistan, and North Korea) possess nuclear weapons.

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