To divert the pressure, on December 3, in the dark of night, even before India could attack East Pakistan, Pakistan opened western front and air raided six Indian Airfields in Kashmir and Punjab.The CIA reported to the US President that Indian Prime Minister believes that the Chinese will never intervene militarily in North India, and thus, any action from China would be a surprise for India and Indian military might collapse in tensed situation caused by fighting in three different fronts (East, North and West).The revenue from export, whether it was from the Cotton of West Pakistan or Jute of East Pakistan, was handled mainly by West Pakistan.
Indians were preparing for war and were concentrated on the Eastern front.
On December 10, Nixon instructed Kissinger to ask the Chinese to move some troops toward the Indian frontier.
‘Threaten to move forces or move them, Henry, that’s what they must do now.’ China feared any action on India might attract Soviet aggression.
The situation soon attracted the attention of many other countries.
Thus the war later was not only between India and Pakistan, but many countries were involved in 1971 Indo Pakistani war (War of Liberation of Bangladesh) directly or indirectly.