5 United Kingdom
The country has own a wide variety of mass destruction weapons including chemical, biological and nuclear weapons. It is the official state for nuclear weapon along with 4 others under Nuclear Non-Proliferation Treaty. It has 120 active stockpiles of nuclear war head and 215 total war heads.
In 1956, it rejected and destroyed the biological and chemical weapon general stock. It first tested it nuclear weapon on 3rd October, 1952 with total test being 45. The highest stockpile it had was 520 war heads but at present it has 215 war heads. In 2007, it incurred a cost of £20bn to upgrade its Trident nuclear submarine system and in 2008, it was claimed by The Guardian that £3bn will be spent in up gradation of stockpile of warheads, which will increase its life until 2055.
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