"As its most important international backer, the United States had great influence over Pakistan. But at almost every turning point in the crisis, Nixon and Kissinger failed to use that leverage to avert disaster. Before the shooting started, they consciously decided not to warn Pakistan’s military chiefs against using violence on their own population. They did not urge caution or impose conditions that might have discouraged the Pakistani military government from butchering its own citizenry. They did not threaten the loss of U.S. support or even sanctions if Pakistan took the wrong course. They allowed the army to sweep aside the results of Pakistan’s first truly free and fair democratic election, without even suggesting that the military strongmen try to work out a power-sharing deal with the Bengali leadership that had won the vote. They did not ask that Pakistan refrain from using U.S. weaponry to slaughter civilians, even though that could have impeded the military’s rampage, and might have deterred the army. There was no public condemnation—nor even a private threat of it—from the president, the secretary of state, or other senior officials. The administration almost entirely contented itself with making gentle, token suggestions behind closed doors that Pakistan might lessen its brutality—and even that only after, months into the violence, it became clear that India was on the brink of attacking Pakistan."
January 1, 1970
https://en.wikiquote.org/wiki/Bangladesh_Liberation_War