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The method is based upon the fact that the percentage of radioactive carbon in the atmosphere, and subsequently in our cells, has steadily decreased since the nuclear test ban in 1963.

The U.S. and the Soviet Union signed a nuclear test ban treaty a year later, in 1963, which prohibited further testing of nuclear weapons in space.

The Kremlin said Mr. Putin’s decision to withdraw ratification of the test ban treaty doesn’t mean it will resume testing.

The latest tests will be seen as a display of force which coincides with Moscow de-ratifying an international nuclear test ban treaty.

While Russia is revoking ratification, it would remain a signatory and would continue to cooperate with the test ban treaty organisation and the global monitoring system, which alerts the world to any nuclear test.