U.N. Treaty Banning Nuclear Weapons Takes Effect, Without The U.S. And Other Powers

A U.N. treaty outlawing nuclear weapons went into effect on Friday, having been ratified by at least 50 countries. But the ban is largely symbolic: The U.S. and the world's other nuclear powers have not signed the treaty.

“For the first time in history, nuclear weapons are going to be illegal in international law,” Elayne Whyte, Costa Rica's former U.N. ambassador who oversaw the treaty's creation, tells NPR's Geoff Brumfiel.

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