Scientists suggest the missile defense plan will face big hurdles, especially given its projected timeline and cost.

Professor Michael Clarke, Sky News' security and defence analyst, has been answering your questions again. Watch below and ...

Professor Michael Clarke, Sky News' security and defence analyst, has been answering your questions again. Watch below and ...

The USAF has launched an unarmed Minuteman III ICBM from California, reaffirming the reliability of its nuclear deterrent and paving the way for the Sentinel.

Nations are flexing their military might around Earth, as China, Russia and the United States lock horns in space.