 Complete the following phrase:  A breakthrough in the diplomatic stalemate on this issue occurred as a result of United States President George W. Bushs state visit to Vietnam in November 2006. In the joint statement, President Bush and President Triet agreed further joint efforts to address the environmental contamination near former dioxin storage sites would make a valuable contribution to the continued development of their bilateral relationship. On May 25, 2007, President Bush signed the U.S. Troop Readiness, Veterans Care, Katrina Recovery, and Iraq Accountability Appropriations Act, 2007 into law for the 