India successfully conducted a test of its K-4 intermediate-range ballistic missile from the nuclear-powered submarine INS Arighaat in the Bay of Bengal on October 30, 2023. This test is part of India’s ongoing efforts to bolster its strategic deterrence capabilities and enhance the sea leg of its nuclear weapons triad, which includes land-based and air-based delivery systems.
The K-4 missile, developed by the Defence Research and Development Organisation (DRDO), has a range of approximately 3,500 kilometers and is designed to carry a nuclear payload of up to two tonnes. The successful launch from a submarine is a critical milestone for India, as it demonstrates the operational readiness of its underwater nuclear deterrent. The ability to launch missiles from submarines provides a second-strike capability, which is essential for maintaining a credible deterrent against potential adversaries.
The INS Arighaat, which is the second submarine of the Arihant class, was commissioned into the Indian Navy in 2022. The Arihant class submarines are India’s first indigenous nuclear-powered ballistic missile submarines (SSBNs) and are integral to the country’s nuclear strategy. The successful test of the K-4 missile from INS Arighaat underscores the advancements in India’s indigenous defense capabilities and its commitment to maintaining a credible nuclear deterrent.
India’s pursuit of a sea-based nuclear deterrent is rooted in its strategic doctrine, which emphasizes a no-first-use policy regarding nuclear weapons. This doctrine aims to deter adversaries by ensuring that any nuclear attack on India would be met with a devastating retaliatory strike. The K-4 missile enhances this capability by allowing for a more survivable and flexible response to nuclear threats.
The test comes at a time of heightened regional tensions, particularly with neighboring Pakistan and China. Both countries possess nuclear arsenals and have engaged in military modernization efforts. The K-4 missile’s successful test is likely to be viewed as a significant development in the context of India’s security environment, as it enhances the country’s ability to deter potential aggression from these nations.
The K-4 missile is part of a broader effort by India to develop a comprehensive nuclear triad, which includes land-based missiles, air-launched weapons, and submarine-launched systems. The development of the K-4 missile follows the successful testing of the K-15 missile, which has a shorter range of approximately 750 kilometers and is also designed for deployment on submarines. The K-4’s longer range allows India to target adversaries further away, thereby expanding its strategic reach.
The successful test of the K-4 missile is also significant from a technological standpoint. The missile is solid-fueled, which allows for quicker launch readiness compared to liquid-fueled missiles. This characteristic is particularly important for submarine-launched systems, where the ability to launch quickly can be critical in a crisis situation. The K-4’s advanced guidance and navigation systems further enhance its accuracy and reliability, making it a formidable component of India’s nuclear arsenal.
In addition to its military implications, the K-4 missile test also has diplomatic ramifications. India’s development of its nuclear capabilities is closely monitored by the international community, particularly by countries involved in arms control and non-proliferation efforts. While India is not a signatory to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), it has consistently advocated for responsible nuclear stewardship and has engaged in dialogues regarding nuclear disarmament.
The successful test of the K-4 missile from INS Arighaat is a clear indication of India’s commitment to maintaining a credible and effective nuclear deterrent. As regional dynamics continue to evolve, the implications of this test will likely resonate beyond India’s borders, influencing security calculations in South Asia and shaping the strategic landscape in the Indo-Pacific region.
In conclusion, the K-4 missile test represents a significant advancement in India’s defense capabilities and underscores the importance of a robust nuclear deterrent in the context of regional security. As India continues to develop its military technologies, the international community will be closely watching the implications of these advancements for regional stability and security.


