Confusion and ambiguity are dangerous in nuclear brinksmanship. President Donald Trump spread both on Wednesday when he ...

The allegations were leveled by U.S. officials late last week. Arms control experts worry that norms against nuclear testing ...

To protect Allied astronauts and spacecraft, U.S. commanders need to stage a preemptive strike on Russia’s atomic-armed ASAT missile before it can be launched into orbit.

A top arms diplomat at the State Department recently laid out what might come next as Washington upends decades of federal policies on nuclear proliferation.

Trump wrote that he had instructed the Department of War to start testing nuclear weapons “on an equal basis” with China and Russia. But those instructions may have been sent to the wrong department.

Should the U.S. and Russia resume nuclear testing? The answer to that question must be a resounding “No.” Yet President Donald Trump and Russian leader Vladimir Putin, eager to project strength, have ...

President Donald Trump ordered the Department of War to resume testing nuclear weapons “on an equal basis” with Russia and China on Thursday, a practice halted by the U.S. in 1992. The announcement ...

Top U.S. nuclear official accuses China of conducting a secret nuclear test in 2020 and confirms plans to restart U.S.

Several nations boast nuclear arsenals, although nearly 90% of all nukes belong to a minority. Here's who holds the lion's ...