confrontation ensued, the Soviets stipulated they would not use Cienfuegos for submarines bearing ballistic missiles, and the final round of diplomatic notes were exchanged in November. The election of Marxist candidate Salvador Allende as President of Chile in September 1970 spurred a vigorous campaign of covert opposition to him by Nixon and Kissinger. This began by trying to convince the Chilean congress to confirm Jorge Alessandri as the winner of the election, and then messages to military officers in support of a coup. Other support included strikes organized against Allende and funding for Allende opponents. It was even alleged that "Nixon personally authorized" $700,000 in covert funds to print anti-Allende messages in a prominent Chilean newspaper. Following an extended period of social, political, and economic unrest, General Augusto Pinochet assumed power in a violent coup d'état on September 11, 1973; among the dead was Allende. Soviet Union Nixon used the improving international environment to address the topic of nuclear peace. Following the announcement of his visit to China, the Nixon administration concluded negotiations for him to visit the Soviet Union. The President and First Lady arrived in Moscow on May 22, 1972, and met with Leonid Brezhnev, the General Secretary of the Communist Party; Alexei Kosygin, the Chairman of the Council of Ministers; and Nikolai Podgorny, the Chairman of the Presidium of the Supreme Soviet, among other leading Soviet officials. Nixon engaged in intense negotiations with Brezhnev. Out of the summit came agreements for increased trade and two landmark arms control treaties: SALT I, the first comprehensive limitation pact signed by the two superpowers, and the Anti-Ballistic Missile Treaty, which banned the development of systems designed to intercept incoming missiles. Nixon and Brezhnev proclaimed a new era of "peaceful coexistence". A banquet was held that evening at the Kremlin. Nixon and Kissinger planned to link arms control to détente and to the resolution of other urgent problems through what Nixon called "linkage." David Tal argues: Seeking to foster better relations with the United States, China and the Soviet Union both cut back on their diplomatic support for North Vietnam and advised Hanoi to come to terms militarily. Nixon later described his strategy: In 1973, Nixon encouraged the Export-Import Bank to finance in part a trade deal with the Soviet Union in which Armand Hammer's Occidental Petroleum would export phosphate from Florida to the Soviet Union, and import Soviet ammonia. The