India, Nov. 23 -- The global crisis of "nuclear sharing" and the weakening of nuclear deterrence draws from the erosion of longstanding arms control treaties, heightened strategic mistrust among major powers, and the proliferation of both state and non-state nuclear ambitions. In South Asia, recent convergences among China, Pakistan, and Bangladesh have intensified regional calculations, raising concerns over Bangladesh's strategic trajectory, especially amid the political rise of Islamists.

Nuclear sharing-whereby nuclear states extend deterrence through the forward deployment or potential transfer of nuclear weapons to non-nuclear allies-has come under increasing scrutiny. This practice blurs the line between nuclear-weapon states (NWS...