• USA – 1st nuclear test – July 16, 1945
• USSR/Russia – 1st nuclear test – August 29, 1949
• UK – 1st nuclear test – October 3, 1952
• France – 1st nuclear test – February 13, 1960
• China – 1st nuclear test – October 16, 1964
• 1968 – Nuclear Nonproliferation Treaty (NPT)
• India – 1st nuclear test – May 18, 1974
• 1996 – Comprehensive Nuclear Test Ban Treaty (CTBT)
• Pakistan – 1st nuclear test – May 28, 1998
• North Korea – 1st nuclear test – October 9, 2006

Countries believed to have pursued secret nuclear weapons programmes.

• Israel – developed first nuclear weapon in 1968 – post 1967 Arab Israel war.