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.

President Donald Trump's comments Thursday suggesting the United States will restart its testing of nuclear weapons upends decades of American policy in regards to the bomb, but come as Washington's ...