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Many countries have nuclear weapons today including the United States. China, North Korea, South Korea, and Japan also have nuclear weapons.
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the first five countries that were involved in nuclear weapons are as follows;United StatesGermanyGreat BritainRussiaArgentina
As of 2012, the countries with the most nuclear weapons, counting actively deployed and stockpiled ones, are, in order of most to least:RussiaUnited StatesFrancePeople's Republic of China (mainland)United KingdomPakistanIsraelIndiaNorth Korea