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5. United Kingdom
Back in the days, the UK had had over 500 nuclear weapons and had conducted over the 45 tests. The country first opened a nuclear power station in 1956, but the country has deactivated several of its warheads with some 215 nuclear missiles still active. UK is one of the most powerful and strongest nuclear countries in the world which is why it’s also one of the most feared countries and nobody wants to lock horns with the UK.