During the 1962 Taiwan Strait tension, President Chiang Kai-shek was preparing his military for a counter-attack in the midst of the turmoil in the PRC. The US supported the ROC under the obligations of the 1954 mutual defense treaty; however, it ruled out provocative military actions against the Chinese Communists unless a prior agreement was reached. In June 1962, the US and the PRC, through ambassadorial talks in Warsaw, reached a tacit understanding thereby bringing an end to Chiang's military preparations. After the Bay of Pigs fiasco in 1961, the Kennedy administration was cautious in undertaking covert actions overseas against communist regimes. Without hard evidence of the imminent collapse of Communist China, the US did not share President Chiang's confidence over the assessment of the situation in China. The US committed to the protection of the Quemoy and Matsu islands but stopped short of supporting Chiang's grand strategy of bringing about the collapse of the Chinese Communist regime.