Pakistan laughs as it helps itself to Kashmir, all while India bleeds white. Really, India doesn't need nor want to annex Bangladesh. It's already earned its friendship and gave Pakistan an unrecoverable punch through the chest by halving its land and population. If it really wanted to annex Bangladesh, all it needed was to stay back and try to build up pro-Indian support peacefully. Otherwise, not a whole lot of compulsion to claim Bangladesh, not the least from Indira Gandhi.