India- Bangladesh share South Asia’s longest border, sharing landmass with over 4000 km running across states like West Bengal, Tripura, and Assam, as well as riverine porous terrain. This historical geography has enabled illegal migration, human trafficking, insurgent safe havens, and extremist networks. In the 1990s and early 2000s, concerning extremist networks such as the United Liberation Front Asom (ULFA) and the National Democratic Front of Bodoland (NDFB) often used Bangladeshi soil for shelter, while Bangladeshi groups like Jamaat-Ul-Mujahdeen Bangladesh (JMB) exploited Indian territories for recruitment and logistics to and from.