The Zaporizhzhia site in southeastern Ukraine has lacked external power to cool its reactors for five days. Kyiv says Moscow ...

Russia’s decision to end its self-imposed restriction on the deployment of intermediate-range ballistic missiles has further raised tensions across European capitals and in Washington amid fears of a ...

A swarm of Russian drones flew last week into Poland in what officials there regarded as a deliberate provocation. NATO ...

Russia is offering the United States a deal that would extend by one year the last remaining nuclear arms treaty between the ...

Russia’s top nuclear official this week said Moscow is facing "colossal threats" and needs to update its nuclear capabilities. Without directly naming where Russia’s chief nuclear threat is coming ...

For decades, the threat of nuclear conflict between the U.S. and the Soviet Union hung over humanity — and occasionally the superpowers edged toward the brink, as with the Cuban missile crisis. But ...

Former Russian President Dmitry Medvedev said on Monday that Europe could not afford a war against Russia but that if its leaders made the mistake of triggering one then it could escalate into a ...

Ellie Cook is a Newsweek security and defense reporter based in London, U.K. Her work focuses largely on the Russia-Ukraine war, the U.S. military, weapons systems and emerging technology. She joined ...