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WATCH LIVE: Obama delivers speech at the Brandenburg Gate

The president will renew his call for the United States and Russia to reduce the number of strategic nuclear warheads to between 1,000 and 1,100 — down from the 1,550 set under the START treaty ratified in 2010.

"The president has determined that we can ensure our security and that of our allies and partners, and maintain a strong, credible strategic deterrent while safely pursuing up to a one-third reduction in deployed strategic nuclear warheads below the New START Treaty level," a senior administration official told The Associated Press.

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