I don’t think Pakistan is in a position to give a nuclear umbrella to Bangladesh or even countries like Turkey or KSA(as is normally suggested).
Pakistan is just an average player in the big scheme of things…militarily somewhat strong…but not in a position to be able to get caught in such complexity and come out the other end having delivered on such a promise.
An example that comes to mind is that of the alliances of mutual defense that dragged multiple European powers to war in WW1…which started from the assassination of Franz Ferdinand(certainly a small event when compared to something as large as a world war). Due to the complex alliances…other countries had to jump in the mix.
While that was not a nuclear umbrella…but it is a similar concept. Who determines a threshold? At what point of conflict do nukes come in to play? Does a simple border skirmish count? Or is it only in the event that BD is nuked by India…in which case it would up being a no first use policy…which Pakistan doesn’t have.
…if India attacks BD…and Pakistan doesn’t think that such an attack is worth replying with nukes(as it would lead to India nuking Pakistan). It would make Pakistan’s promise of nuclear umbrella look hollow…just mere words.
…if Pakistan does respond with nukes…so would India…and the whole subcontinent would be done for.
Instead it would be far better for Pakistan/BD/China to try and have a commonality in terms of weapons of war and train with each other frequently while building strong alliances. This way if it ever comes down to it in a situation of war..where flames spread to such an extent that it draws in the neighbors…it would enable a synergy between these three countries(China/Pak/BD) in terms of logistics, communication/intelligence sharing, etc…so the three would be able to essentially fight as one(think NATO).
At the same time…if BD feels threatened by its bigger neighbor…BD could develop its own nuclear weapons…which would be far easier for BD to then determine its own nuclear policy and threshold without complicating the matter(that would occur if other nations were involved).
@Al-Zakir @Avicenna @UKBengali @AbuShalehRumi