China: The role of China was very much questionable as they were trying to help Pakistan because of their self-interest to ensure their stronghold in South Asia which Pakistan could help them to get established.
China was trying to portray this war as the internal matter of Pakistan where the whole world was supporting Bangladesh as Pakistan was inhumane and they were committing a mass genocide by killing millions of people. China could have played a better role instead of helping Pakistan in these heinous activities.
USA: The United States of America didn’t play any praise-worthy role during the Liberation War period as they did not want to make their bilateral relationship with Pakistan bad because of this issue.
The USA treated this war as the internal matter of Pakistan and they were secretly helping Pakistan financially and logistically. They raised the proposal of the ceasefire in East Pakistan on the 4th December of 1971 which was done to save Pakistan from getting defeated.
Bangladesh got her independence on the 16th December of 1971 and 3 million people sacrificed their very own lives to get the freedom. Two lacs women were being abused physically and they were mentally traumatized because of what they had to go through. After all of these sacrifices, Bangladesh got to reach her desired destination by establishing herself as an independent country in the world map.