Pakistan's nuclear arsenal: a strategic response to regional insecurity and historical isolation

Nature · Published 30 September 2026 Swipe more like this →

In short: Following the 1971 war, Pakistan launched a clandestine nuclear programme to secure its survival against India. Supported by domestic research and foreign financial backing, the nation transitioned from a non-nuclear policy to becoming one of nine nuclear-armed states, maintaining a doctrine of full spectrum deterrence to protect its national interests.

The origins of Pakistan's nuclear programme trace back to 1972, initiated by Prime Minister Zulfikar Ali Bhutto after the 1971 Indo-Pakistani War. Feeling isolated and threatened by India's advancing nuclear capabilities, Bhutto famously vowed to secure a bomb regardless of the economic cost. This effort relied on a mix of domestic scientific development, led by figures like Munir Ahmad Khan and Abdus Salam, and clandestine procurement networks. The programme also benefited from significant financial and material support from various Arab and Muslim-majority states, including Saudi Arabia and Libya, which helped sustain the project through periods of international sanctions and economic pressure.

Technical development was marked by the establishment of the Theoretical Physics Group and the later creation of the Kahuta Research Laboratories under Abdul Qadeer Khan, who utilized his experience from the Urenco Group to advance uranium enrichment. While the programme initially explored gun-type designs, it eventually shifted to more complex implosion-type weapons. By 1983, Pakistan conducted its first subcritical cold test, codenamed Kirana-I, followed by 24 additional cold tests through 1994. These efforts culminated in the 1998 Chagai-I and Chagai-II tests, which confirmed Pakistan's status as a nuclear-armed power.

Today, Pakistan's nuclear doctrine, known as full spectrum deterrence, rejects a no-first-use policy, emphasizing the use of any available weapon to counter perceived threats. The arsenal, estimated at 170 weapons as of 2025, includes land-based ballistic missiles and air-delivered bombs. Despite international concerns regarding proliferation and security, Pakistan has engaged with the IAEA to apply safeguards to its civilian power plants. While officials claim the country possesses the world's strongest nuclear security, this assertion remains heavily contested by foreign experts who point to regional instability and historical vulnerabilities.

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