India and Japan have strengthened defense ties with the signing of a Memorandum of Implementation for the co-development of the UNICORN mast, enhancing naval stealth capabilities. This collaboration also opens avenues for India to access Japan’s advanced Soryu-class lithium-ion battery technology for submarines, promising improved efficiency and operational stealth in the Indian Ocean Region. The recent visit of Indian Navy Chief Admiral Dinesh K Tripathi to Japan underscores India’s commitment to deepening joint R&D and overcoming challenges related to technology transfer. This strategic partnership highlights the growing collaboration between Quad allies, emphasizing India’s proactive approach to modernizing its naval capabilities.