 Complete the following phrase:  The more assertive human rights policy championed by Derian and State Department Policy Planning Director Anthony Lake was somewhat blunted by the opposition of Brzezinski. Policy disputes reached their most contentious point during the 1979 fall of Pol Pots genocidal regime of Democratic Kampuchea following the Vietnamese invasion of Cambodia, when Brzezinski prevailed in having the administration refuse to recognize the new Cambodian government due to its support by the Soviet Union. Despite human rights concerns, Carter continued U.S. support for Joseph Mobutu of Zaire, who defeated Angolan-backed insurgents in conflicts known as 