FRONTIER SHADOWS: EXAMINING THE SECURITY PARADIGM AND CROSS-BORDER TERRORISM IN PAKISTAN AND AFGHANISTAN

Abstract

The Pakistan-Afghanistan frontier constitutes one of the most volatile and consequential security environments in the contemporary world. The porous, ethnically complex, and historically contested nature of the Durand Line has long provided insurgent and terrorist networks with geographic depth, social cover, and logistical corridors to sustain cross-border violence against Pakistan’s state institutions and civilian populations. Since the Taliban's return to power in August 2021, this security landscape has undergone a fundamental reconfiguration: Tehrik-e-Taliban Pakistan (TTP), Islamic State Khorasan Province (ISKP), and affiliated militant organizations have dramatically escalated their operational tempo, enlisting Pakistan to the most affected country of the world on Global Terrorism Index (GTI) in 2026.  Grounded in borderlands theory as its primary theoretical lens with supplementary use of insurgency and counter-insurgency (COIN) framework, this article employs a comparative and empirical content analysis of cross-border terrorism between 2021 and 2026. The study examines the structural historical, ethnic, and geopolitical variables that shaped this security paradigm; interrogates the Islamic Emirate of Afghanistan's (IEA) role in enabling militant sanctuaries; assesses Pakistan's counterterrorism and border management responses; and situates the bilateral security dilemma within its broader regional and international contexts. The findings demonstrate that the persistence of cross-border terrorism is not merely a military or intelligence failure but a structural consequence of contested sovereignty, deep-rooted ethno-tribal affinities, and governance deficits. The article concludes with evidence-based policy recommendations for bilateral cooperation, regional engagement, and international frameworks.