Bangladesh should develop a defense pact with China. Thats honestly the most reliable deterrent. Why? B/c even though Pakistan may wish to come to Bangladesh's aid, I'm not saying its impossible to help, but there are geographic challenges.
Which China its different, China is far closer regionally and itself a hegemon.
A trilateral cooperation arrangement, similar to the one South Korea, Japan and the US have against North Korea. Could potentially be employed with Pakistan, Bangladesh and China.
China has territorial disputes with India in the very same region. And India is significantly vulnerable in that area, with their chicken neck corridor.
That trilateral cooperation would ensure a decisive deterrent against India, as any move on Bangladesh would end up with then losing all land Essentially East of Bihar, even West Bengal has a significant Muslim Minority.
The moving of the front eastwards also complicates things for them on the western front, they are going to have quite a bit of difficulty fighting a 2 from conflict.
Not to mention any any sort of issue will spur southern states in india to seek independence from the north, afterall they are the most prosperous states, they speak a different language and in many ways are very culturally different from Northern Indian, why tie themselves to the baggage of carrying less prosperous regions who are also the primary source for creating tensions in India, and geopolitical issues.
They are a lot more vulnerable that what the hindutwa internet Keyboard "warriors" will have you believe, with them threatening to invade Bangladesh b/c they their preferred candidate is not ruling the country.
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