India continues to modernize its nuclear arsenal, with at least four new weapon systems now under development to complement or replace existing nuclear-capable aircraft, land-based delivery systems, and sea-based systems.
An article published in the July-August issue of the digital journal - After Midnight - has also claimed that India is now developing a missile which can target all of China from its bases in South India.
India is estimated to have produced enough plutonium for 150-200 nuclear warheads but has likely produced only 120-130, wrote Hans M Kristensen and Robert S Norris in the article - "Indian nuclear forces 2017".
Kristensen and Norris said that the two-stage, solid-fuel, rail-mobile Agni-2, an improvement on the Agni-1, which can deliver a nuclear or conventional warhead more than 2,000 kilometres is probably targeted on western, central, and southern China.
Although the Agni-4 will be capable of striking targets in nearly all of China from northeastern India (including Beijing and Shanghai), India is also developing the longer-range Agni-5, a three-stage, solid-fuel, rail-mobile, near-intercontinental ballistic missile (ICBM) capable of delivering a warhead more than 5,000 kilometres (3,100-plus miles), it said.
India operates a ship-launched nuclear-capable ballistic missile and is developing two submarine-launched ballistic missiles (SLBMs). According to Kristensen and Norris three or four squadrons of Mirage 2000H and Jaguar IS/IB (and possibly also MiG-27) aircraft, at three bases, are assigned nuclear strike missions.