"Nine months later, however, the Politburo reversed itself, launching a massive invasion of Afghanistan, the consequences of which would more than confirm Kosygin's prophecy. The reasons reveal how "ideological bondage" led to strategic disaster. Having for the most part lost the support of the Afghan people, the leadership in Kabul fell into near civil war during the summer of 1979. In September, Taraki, just back from Moscow, tried unsuccessfully to assassinate his chief rival, Hafizullah Amin, only to have Amin arrest and execute him. That upset Brezhnev, who had personally promised Taraki support; it also alarmed Soviet intelligence, which knew that Amin had studied in the United States and had now initiated quiet contacts with Washington. The concern, as one K.G.B. officer put it, was that Amin was "doing a Sadat on us"—that if left in power, he would kick the Russians out, allow the Americans in, and invite them to place "their control and intelligence centers close to our most sensitive borders." There seemed to be no alternative to replacing the new Afghan leader, but the only way to do that, the Soviet defense ministry insisted, was to send in some 75,000 troops to crush whatever internal resistance or foreign intervention might follow."