U.S. President-elect Donald Trump will inherit rising nuclear dangers in five regions of the globe. Every one of them could get worse under his watch. Even before taking office, he has challenged Russia with a nuclear arms race it cannot win, while provoking China over Taiwan. He has threatened to rip up the Obama administration’s nuclear agreement with Iran, even though it could prevent Tehran from building nuclear weapons for 15 years. North Korea’s young leader, Kim Jong-un, has threatened to disregard the incoming president’s warning not to flight-test a new intercontinental ballistic missile (ICBM). If that doesn’t sound bad enough, look no further than the subcontinent, where Pakistan and India are engaged in an intense nuclear competition with little likelihood of slowing down.

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