Weapons : proliferation : agreement between the United States of America and Azerbaijan, signed at Baku and Washington, May 6 and June 6, 2005 and agreements amending the agreement: signed at Baku and Washington, June 12 and 23, 2006; signed at Baku and Washington, February 28 and March 6, 2007; signed at Baku and Washington, September 12 and October 5, 2007; signed at Baku and Washington, February 13 and March 5, 2008; signed at Baku and Washington, April 13 and August 13, 2009.