I think talwar class have littoral capabilities along with deep sea, These frigates are attached with western fleet, Vikramaditya is presently attached with western fleet with sea king ASW helicopter as well, Though at western sector PN can not have any real strategic victory ..
In case of PLAN, SCS is their back yard and if Indian went into offensive operation it have to go into SCS but in practical world its Andaman sea ( Littoral zone ) which is the real frontier for us..
In case of War PLAN will try to push inside and capture Andaman island chain if not all then some, For this they need to insert D&E subs through Andaman sea ( Littoral zone ) as these will act as scouts and if they get into Bay of Bengal ( Deep sea ) they an put a halt to supply chain of IN to support Andaman Island defenders, No island static defense can survive with support of fleet, If i recall PLAN has a intel post at north of Andaman island chain ..
To counter such measures, IN eastern fleet has Jalashwa ( Helicopter carrier ) and Shivilik frigates which are consider the best in IN, IN deployed most technological advance vessels at eastern sector ..