Why have you started bickering without knowing that the 7th fleet arrived in the BoB in December 1971 and the war between east and west started on March 26?aim was to intimidate India and support the west Pakistanis in the war , like you are doing.
As usual you ask a question and then change the goalposts to ingratiate yourselves with your hosts here.
So, it was essentially to protect east Pakistan/ Bangladesh from Indian occupation. No wonder, the IA troops had to vacate Dhaka in March 1972.
Please study hard and learn that the 7th fleet did not come on 26 March 1971. Indians have little brain power to my surprise.