Nukes in a Globalizing World

President Obama on Wednesday called for Russia and the United States to each eliminate hundreds of warheads from their fielded long-range nuclear arsenals. If Moscow agrees, the cuts to a new ceiling of roughly 1,000 weapons on each side would constitute a one-third reduction below currently agreed ceilings under the 2011 New START agreement.

Speaking in Berlin, the U.S. leader built on the themes of his iconic 2009 speech in...