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A Russian Yars ballistic missile mounted on a mobile launcher during a rehearsal for the Victory Day military parade in Red Square in 2018. Russia has refrained from testing its nuclear weapons since the 1990s.

A Russian Yars ballistic missile mounted on a mobile launcher during a rehearsal for the Victory Day military parade in Red Square in 2018. Russia has refrained from testing its nuclear weapons since the 1990s. Alexander Zemlianichenko/AP hide caption

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Alexander Zemlianichenko/AP

National Security

Russia is scrapping its ratification of a key nuclear test ban. Here's what that means

The world's major nuclear powers haven't tested a bomb this century, but experts worry that may be about to change.

Russia is scrapping its ratification of a key nuclear test ban. Here's what that means

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