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America’s Nuclear-Deterrence Challenge in Asia

The NATO playbook can help keep South Korea and Japan from pursuing bombs of their own.

In the shadow of the Hiroshima Peace Memorial, U.S. President Barack Obama spoke recently about the danger of nuclear proliferation and the dream of a world without nuclear weapons. To arrest the spread of such weapons, however, the United States may need to reinforce its nuclear-deterrence commitments in East Asia, where both South Korea and Japan could face mounting pressure to go nuclear...