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Nuclear Arithmetic, Deterrent Calculus

K Santhanam sent the Indian media into a flutter with his statement that the thermonuclear device (Shakti-I) tested in 1998 during Pokhran II was not completely successful and did not produce the anticipated (and reported) yield of 40-45 kT.  He put this apparent failure in the context of the Comprehensive Test Ban Treaty (CTBT), advocating that we do not sign or ratify the treaty until India’s thermonuclear capability can be successfully demonstrated.

Notwithstanding denials from APJ Abdul Kalam, Admiral Sureesh Mehta, R Chidambaram and Brajesh Mishra, the vast differential in the reported vs. observed yield is no secret.  International nonpartisan sources, such as the Federation of American Scientists (FAS) indicated 10  years ago that yield of Shakti-I was between 12-25 kT.  Indeed, Santhanam’s statements were also corroborated by both former AEC chairman PK Iyengar, and national security expert Bharat Karnad.

However, this admission does not change India’s nuclear posture much, either with regard to Pakistan or China.  Nuclear weapons are a deterrent force and Pakistan will neither be emboldened nor hindered by the admission of this yield differential, in the event that it is contemplating a nuclear attack against India, in the face of rapidly deteriorating circumstances during a conventional war.

A nuclear bomb is a nuclear bomb. Indeed, the credibility of Pakistan’s own nuclear tests in Chagai were marred by reports of a significant divergence between reported vs. observed yields.  While Pakistan reported tests of six nuclear devices (two in the kT range, and four in the sub-kT range) with a total yield exceeding 36 kT, nonpartisan sources indicate the May 28, 1998 tests produced a total yield of between 9-12 kT.

However, despite such reports, Pakistan’s arsenal consisting largely of tactical nuclear weapons (TNW) acted as a very credible deterrent against possible Indian offensives across the LoC during Kargil.  Additionally, had Pakistan’s “diminished” nuclear capability been a factor, India’s responses to the December 13, 2001 Parliament attack and the recent 26/11 Mumbai attacks would have been very different indeed.

The nuclear calculus also doesn’t change much with regard to China.  India’s current nuclear posture continues to be incongruous to its “No First Strike” nuclear doctrine.  The nuclear triad, a corollary to the “minimum credible deterrence” and “No First Strike” policies remains unfulfilled, with two of three legs of the triad not currently being operational (with respect to China).  While India has taken the first step in the development of nuclear-powered submarines, the first of these, INS Arihant, will not be operational for sometime.

The most serious challenge to India’s “minimum credible deterrence” is its crippled missile program.  India’s longer range Agni-III IRBMs are as yet incapable of hitting strategic targets such as Beijing or Shanghai. The development, production and weaponization of the Surya-I and Surya-II ICBMs have experienced delays exceeding 10 years, as a result of high-technology denials by the US and the sloth-like inertia of DRDO.

Without true ICBM capability and bereft of an operational nuclear-powered submarine, India’s deterrence against Chinese aggression remains challenged; a 12 kT fission bomb or 50 megaton hydrogen bomb changes nothing under these circumstances.

The low yield of Shakti-I alters neither Pakistan’s perception of Indian retaliatory capability in the event of a Pakistani nuclear first strike, nor does it hurt any further, India’s credibility in being able to deploy nuclear payload to strategic targets in China, should the need arise.  Shakti-I changes nothing with regard to Pakistan; however, if looked through the prism of maintaining a credible deterrent against China, should reignite a debate  on the sorry state of India’s delivery systems and the credibility and logic behind our “No First Use” posture.

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