 Military aid from the US grew, but the country's national security was severely compromised following the exposure of U2 secret spy operations launching from Peshawar to overfly the Soviet Union in 1960.The same year Pakistan signed the Indus Waters Treaty with India in an attempt to normalise relations.Relations with China strengthened after the Sino-Indian War, with a boundary agreement being signed in 1963; this shifted the balance of the Cold War by bringing Pakistan and China closer together while loosening ties between Pakistan and the United States.