By Xiaodon Liang

Yemeni President Ali Abdullah Saleh (Image Source: Government of Yemen)

President Obama in 2009 at Hradcany Square Prague, Czech Republic (Image Source Christian Science Monitor)

By Greg Thielmann

By Jeff Abramson

By Tom Z. Collina and Daryl G. Kimball The Obama administration is "committed" to working with Senators of both parties to ratify the Comprehensive Test Ban Treaty (CTBT), National Security Advisor Tom Donilon said March 29, "just as we did for New START." This was one of the most significant, high-level statements from a senior administration official on the test ban since April 2009, when President Obama called on the Senate to reconsider the treaty.

By Jeff Abramson As the year progresses, we'll revisit the mid-term grades given the Obama administration on their conventional weapons policies. For the moment, the D grade on cluster munitions remains unchanged because U.S. policy is unchanged, but there is much happening: Libya

RS-24 Yars ICBM, Associated Press

By Greg Thielmann

By Alfred Nurja

Image Source: CNS

Robert J. Einhorn, Special Advisor for Nonproliferation and Arms Control, Department of State

Image Source: Wall Street Journal

By Alfred Nurja