Soviet Union and the United States to keep control over their spheres of influence. U.S. President Lyndon B. Johnson landed 22,000 troops in the Dominican Republic in 1965, claiming to prevent the emergence of another Cuban Revolution. While the period from 1962 until Détente had no incidents as dangerous as the Cuban Missile Crisis, there was an increasing loss of legitimacy and good will worldwide for both the major Cold War participants. 30 September Movement The 30 September Movement was a self-proclaimed organization of Indonesian National Armed Forces members who, in the early hours of 1 October 1965, assassinated six Indonesian Army generals in an abortive coup d'état. Among those killed was Minister/Commander of the Army Lieutenant General Ahmad Yani. Future president Suharto, who was not targeted by the kidnappers, took command of the army, persuaded the soldiers occupying Jakarta's central square to surrender and oversaw the end of the coup. A smaller rebellion in central Java also collapsed. The army publicly blamed the Communist Party of Indonesia (PKI) for the coup attempt, and in October, mass killings of suspected communists began. In March 1966, Suharto, now in receipt of a document from Sukarno giving him authority to restore order, banned the PKI. A year later he replaced Sukarno as president, establishing the strongly anti-communist 'New Order regime. 1968 invasion of Czechoslovakia A period of political liberalization took place in 1968 in Eastern Bloc country Czechoslovakia called the Prague Spring. The event was spurred by several events, including economic reforms that addressed an early 1960s economic downturn. In April, Czechoslovakian leader Alexander Dubček launched an "Action Program" of liberalizations, which included increasing freedom of the press, freedom of speech and freedom of movement, along with an economic emphasis on consumer goods, the possibility of a multiparty government and limiting the power of the secret police. Initial reaction within the Eastern Bloc was mixed, with Hungary's János Kádár expressing support, while Soviet leader Leonid Brezhnev and others grew concerned about Dubček's reforms, which they feared might weaken the Eastern Bloc's position during the Cold War. On August 3, representatives from the Soviet Union, East Germany, Poland, Hungary, Bulgaria, and Czechoslovakia met in Bratislava and signed the Bratislava Declaration, which declaration affirmed unshakable fidelity to Marxism-Leninism and proletarian internationalism and declared an implacable struggle against "bourgeois" ideology and all "anti-socialist" forces. On the night of August 20–21, 1968, Eastern Bloc armies from