LONDON — In January, the leaders of the Bulletin of the Atomic Scientists announced, for the third year in a row, that the world was at “doom’s doorstep.” The group declared that the Doomsday Clock stood at 100 seconds to midnight — the closest the world has ever been to catastrophe since the clock was created in 1947.

But that was more than eight months ago, before Russia invaded Ukraine and before North Korea kick-started its latest provocative series of ballistic missile testing. In the past two weeks, North Korea has conducted six such launches.

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