Questions have arisen after Russian President Vladimir Putin said his country tested two nuclear-capable weapons this week.

If you wanted to know how Donald Trump would approach his sternest diplomatic test so far, all you had to do was listen to ...

Moscow has said that if the US resume nuclear weapons testing it will do so too, sparking fears of a renewed arms race. The ...

U.S. President Donald Trump reacts to dancing performers during a welcoming ceremony after arriving at Kuala Lumpur ...