A thousand feet beneath the desert, the United States conducts experiments to verify that its weapons work. But some fear a ...

In fact, somewhere in the maze of tunnels we're walking through is a sealed shaft from a full-scale nuclear detonation — the Ledoux test in 1990. Loading... The Ledoux test was among the last ...

Russia's point man for arms control cautioned Donald Trump's incoming administration against resuming nuclear testing, saying Moscow would keep its own options open.

Analyst: I am not surprised Ryabkov's comments contradict Vladimir Putin's statement, who said last year that Russia will not conduct a nuclear test as long as the United States does not do so.

North Korea conducted its sixth and last nuclear test in 2017. The agency also said it’s detecting signs, including the placement of launch vehicles, that the North is preparing to test launch ...