GRID:

There are currently nine nuclear powers in the world, but arguably only two nuclear superpowers. The United States and Russia account for around 90 percent of the global nuclear arsenal, with around 4,000 warheads each in their military stockpiles.

There may soon be a third.

A Pentagon report on Chinese military power released at the end of November estimated that China’s nuclear arsenal has now exceeded 400 operational warheads, double the estimate from just two years ago. At current rates of construction, the report suggested, the Chinese nuclear stockpile could reach 1,500 warheads by 2035.

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