In his presentation at the Arms Control Association Annual Meeting, Joe Cirincione concludes, "There are four main obstacles that could prevent President Obama from transforming U.S. nuclear policy."
Russia and the U.S. are due to begin talks on a new treaty to reduce the number of nuclear weapons. The Strategic Arms Reductions Treaty, or START 1, is due to expire in December.
Members of Congress were told in confidential briefings that Pakistan is rapidly adding to its nuclear arsenal even while wracked by insurgency, raising questions on Capitol Hill about whether billions of dollars in proposed military aid might be diverted to Pakistan’s nuclear program. 
President Obama's use of the word “verifiable” in his April 5 Prague speech injected new hope into disarmament talks, putting the 65-nation Conference on Disarmam