The Challenges for Japan’s “Counterstrike Capability”

Abstract

Japan’s pursuit of counterstrike capability exposes tensions between the self-defense limits in Article 9 of its constitution, the evolution of an exclusively defensive defense posture, and international legal standards. Expanding self-defense to include counterstrike requires reconciling constitutional constraints, strategic necessity, and strict tests of necessity and proportionality under Article 51 of the UN Charter. These pressures show that counterstrike is not a technical upgrade but a fundamental challenge to Japan’s legal identity, strategic doctrine, and credibility in the Indo-Pacific.