Add Yahoo as a preferred source to see more of our stories on Google. California Governor Gavin Newsom (D) went off on President Donald Trump's nuclear testing announcement in an upcoming interview ...

In a particularly heated moment from his first term, Trump taunted North Korea’s Kim Jong Un — whose 2017 underground test is the last known example of explosive nuclear testing — for the relative ...

Christopher Yeaw, assistant secretary of State for the Bureau of Arms Control and Nonproliferation, spoke to a U.N.-backed ...

President Donald Trump reiterated his call for the U.S. to resume nuclear testing in a video he posted on his social media platform Truth Social. “Because of other countries’ testing programs, I have ...

President Trump said on Thursday that the U.S. would begin testing nuclear weapons again for the first time in decades. “We’ve halted many years ago, but with others doing testing I think it’s ...

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 ...

America’s top nuclear security official has issued an 'urgent' warning against leaking classified information, as political tension over U.S. nuclear weapons testing intensifies. A reported memo from ...

Add Yahoo as a preferred source to see more of our stories on Google. FILE - In this photo taken from video released by Russian Defense Ministry Press Service on Oct. 26, 2022, a Yars intercontinental ...

Scientific knowledge about the damaging effects of nuclear-weapons testing helped to end such tests. Those findings haven’t changed.