Which diplomatic advisor to US President made a secret visit to China via Pakistan in July 1971 at the time when Bangladesh war was at the forefront?

Henry Kissinger

Henry Kissinger, the adviser to the US President Richard Nixon, made a secret visit to China via Pakistan in July 1971. In order to counter the US-Pakistan-China axis, India signed a 20-year Treaty of Peace and Friendship with the Soviet Union in August 1971. This treaty assured India of Soviet support if the country faced any attack.