India has aircraft and missiles capable of delivering nuclear weapons within a 2,500km range. It is reported to be working on more advanced missiles capable of travelling further.
India became a nuclear power with the test of a crude nuclear device in 1974. The plutonium used in this test was derived from a reactor built with Canadian assistance. It carried out three further tests in 1998.
India is receiving assistance from Russia in developing a civilian nuclear energy programme. Some analysts believe that it could use the same technology to refine its nuclear weapons.