A U.S. official focusing on arms control has provided what he called new, declassified details of a Chinese underground ...

Estonia's foreign minister has signaled the eastern NATO member was open to having nuclear weapons stationed on its soil.

President Trump is pressuring Iran to either curtail its nuclear program or face military strikes, after Iran amassed a large stockpile of highly enriched uranium. Here's what to know.

The head of the U.N. nuclear watchdog agency says Iran's enriched uranium "is still there," as he stresses the urgency of ...

US intelligence agencies believe that China is developing a new generation of nuclear weapons and has conducted at least one covert explosive test in recent years as part of a broader push to ...

Tehran has denied it seeks nuclear weapons and said it was willing to accept some curbs in exchange for sanctions relief.

Remarks by a top administration official appeared to be aimed at dispelling skepticism of its assertions, as President Donald ...

The report will likely spark fears the world could inch closer to a new conflict, with CNN reporting sources who said China also appears to be developing low-yield, tactical nuclear weapons for the ...

US officials reportedly believe China’s nuclear expansion is narrowing the gap with the United States and Russia, potentially ...

This area, known as Lop Nur, or Lop Lake, is often likened by defence experts to Area 51, the fabled compound where the US tests its most classified and cutting-edge aircraft. Isolated and tightly ...

North Korean leader Kim Jong Un has been re-elected as General Secretary of the Workers’ Party of Korea at a rare five-year ...

China appears to be developing low-yield, tactical nuclear weapons, something it has never developed before.