Russia responds after Trump says U.S. will withdraw from nuclear weapons treaty



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Russia is firing back at President Trump's threat to pull out of a landmark nuclear weapons treaty. One Russian official says breaking the pact would be a "very dangerous step." Roxana Saberi reports.Subscribe to the "CBS Evening News" Channel HERE: ---The "CBS Evening News" premiered as a half-hour broadcast on Sept. 2, 1963. Check local listings for CBS Evening News broadcast times.



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