Liberal Democratic Party (LDP) President Eisaku Satō was elected Prime Minister in December 1964 (only a month after China revealed its nuclear weapons capability with a test explosion). Although privately supportive of Japanese nuclearization, circumstances led Prime Minister Satō to first articulate the now-standard Three Non-Nuclear Principles, and he is remembered for his contributions to non-proliferation. Most significantly, he was determined to reacquire the island of Okinawa from U.S. occupation. Frustrated by strong public sentiment against the U.S. nuclear presence there, Satō struck a deal with the Johnson Administration, exchanging control of Okinawa for Japan's entry into the Nuclear Non-Proliferation Treaty (NPT).