Two years later, Rice announced that the deficit had been eliminated and the university was holding a record surplus of over $14.5 million. Rice drew protests when, as Provost, she departed from the practice of applying affirmative action to tenure decisions and unsuccessfully sought to consolidate the university's ethnic community centers. During a farewell interview in early December 2008, Rice indicated she would return to Stanford and the Hoover Institution, "back west of the Mississippi where I belong," but beyond writing and teaching did not specify what her role would be. Rice's plans for a return to campus were elaborated in an interview with the Stanford Report in January 2009. She returned to Stanford as a political science professor and senior fellow at the Hoover Institution on March 1, 2009. she is on the Political Science faculty as a professor of political science and on the faculty of the Graduate School of Business as the Denning Professor in Global Business and the Economy, in addition to being the Thomas and Barbara Stephenson Senior Fellow on Public Policy at the Hoover Institution. In 1986, Rice was appointed special assistant to the Director of the Joint Chiefs of Staff to work on nuclear strategic planning as part of a Council on Foreign Relations fellowship. In 2005, Rice assumed office as Secretary of State. Rice played an important role in trying to stop the nuclear threat from North Korea and Iran. North Korea signed the Nuclear Non-Proliferation Treaty in 1985, but in 2002 revealed they were operating a secret nuclear weapons program that violated the 1994 agreement. The 1994 agreement between the United States and North Korea included North Korea agreeing to freeze and eventually dismantle its graphite moderated nuclear reactors, in exchange for international aid which would help them to build two new light-water nuclear reactors. In 2003, North Korea officially withdrew from the Non-Proliferation Treaty. Rice played a key role in the idea of "six-party talks" that brought China, Japan, Russia, and South Korea into discussion with North Korea and the United States. During these discussions, Rice gave strong talks to urge North Korea to dismantle their nuclear power program. In 2005, North Korea agreed to give up its entire nuclear program in exchange for security guarantees and economic benefits to ensure its survival. Despite the agreement in 2005, in 2006, North Korea test fired long range missiles. The UN Security Council demanded North Korea suspend the program. In 2007, Rice was involved in another nuclear agreement with North Korea (Pyongyang). Rice, other negotiators for the United States and four other nations (six-party talks) reached a deal with North Korea.