BERLIN (AP) -- Summoning the harsh history of this once-divided city, President Barack Obama on Wednesday cautioned the U.S. and Europe against "complacency" brought on by peace, pledging to cut America's deployed nuclear weapons by one-third if Cold War foe Russia does the same.

The president also declared that his far-reaching surveillance programs had saved lives on both sides of the Atlantic, as he sought to defend the controversial data-mining to skeptical Europeans.

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