Smiling Buddha in the context of "Nuclear states"

There are currently nine sovereign states that are generally understood to possess nuclear weapons, though only eight formally acknowledge possessing them. In order of first successful nuclear test, the world's nine nuclear-armed states are the United States (1945), Russia (1949), the United Kingdom (1952), France (1960), China (1964), India (1974), Pakistan (1998), and North Korea (2006); Israel is believed to have acquired nuclear weapons around 1967, but has never openly tested or formally acknowledged having them. Under the Non-Proliferation Treaty (NPT), the United States, Russia, the United Kingdom, France, and China are recognized "nuclear-weapons states" (NWS). They are also the five permanent members of the United Nations Security Council. Israel, India, and Pakistan never signed the NPT, while North Korea acceded to it in 1985 before announcing withdrawal in 2003.

South Africa developed nuclear weapons by 1982 but dismantled them around 1989 and joined the NPT in 1991. Following the dissolution of the Soviet Union in 1991, the former Soviet republics of Ukraine, Kazakhstan, and Belarus had nuclear weapons deployed on their territories, but agreed to transfer them to Russia (which inherited the Soviet Union's international rights and obligations) and join the NPT as non-nuclear-weapon states.

After independence, Jawaharlal Nehru, the first prime minister of India, initiated reforms to promote higher education and science and technology in India. The Indian Institute of Technology (IIT)—conceived by a 22-member committee of scholars and entrepreneurs in order to promote technical education—was inaugurated on 18 August 1951 at Kharagpur in West Bengal by the minister of education Maulana Abul Kalam Azad. More IITs were soon opened in Bombay, Madras, Kanpur and Delhi as well in the late 1950s and early 1960s along with the Regional Engineering Colleges (RECs) (now National Institutes of Technology (NIT). Beginning in the 1960s, close ties with the Soviet Union enabled ISRO to rapidly develop the Indian space program and advance nuclear power in India even after the first nuclear test explosion by India on 18 May 1974 at Pokhran.

India accounts for about 10% of all expenditure on research and development in Asia and the number of scientific publications grew by 45% over the five years to 2007. However, according to former Indian science and technology minister Kapil Sibal, India is lagging in science and technology compared to developed countries. India has only 140 researchers per 1,000,000 population, compared to 4,651 in the United States. India invested US$3.7 billion in science and technology in 2002–2003. For comparison, China invested about four times more than India, while the United States invested approximately 75 times more than India on science and technology. Research and development spending grew to US$17.2 Billion in 2020–2021.