Japan’s Official Security Assistance (OSA) framework, established in 2022, is emerging as one of the most innovative military diplomacy frameworks to engage with maritime South Asia. This expansion underlines an increasing interest of South Asian countries in OSA and Japan’s deepening military engagement with the region. By expanding the OSA, Japan aims to help maintain the region’s political, economic and strategic stability and ensure that regional countries don’t depend entirely China. Better military ties between Japan and regional countries through OSA would also help to ward off Chinese military presence. India could leverage its booming defence industry to export offensive and lethal military equipment, improving recipient countries’ military capabilities.