Reporting from Washington - The Obama administration is releasing a major statement on nuclear weapons policy that will herald a further shrinking of the U.S. arsenal, even as it rejects some sweeping steps advocated by arms control advocates. The statement, to be released Tuesday, will announce that the arsenal will shrink by thousands of warheads, and it will further restrict when the weapons may be used, U.S. officials say. But the administration has rejected proposals to declare that the "sole purpose" of nuclear arms is deterrence, nor will it promise that the United States won't be the first to use...