Experts warn that the expiration of a long-standing nuclear arms control treaty between the two superpowers could mark the start of a new nuclear rivalry.

Since the collapse of the old Soviet Union, Russia has cut a substantially diminished figure on the international stage.

(Corrects to remove phrase 'for more than two decades' in first paragraph) By Dmitry Antonov, Mark Trevelyan and Jonathan Landay WASHINGTON/MOSCOW, Feb 5 (Reuters) - U.S. President Donald Trump on Thursday rejected an offer from his Russian counterpart to voluntarily extend the caps on strategic nuclear weapons deployments after the treaty that held them in check expired.

After years in the wilderness, it’s a good time to be a nuclear startup. “For the first half a decade that I was telling people I was doing nuclear, I had to convince them, ‘Hey, here’s why nuclear is important,’” Bret Kugelmass, founder and ...

Oklo is building small compact nuclear reactors that could provide power to AI data centers. The company is pre-revenue, but its recent acquisition of Atomic Alchemy could offer an early revenue source. Regulatory approval remains a critical milestone that ...

Startorus Fusion raised US$143 million, a record for a private firm, while Supermag New Energy received 'several hundred million yuan' China's pursuit of commercial nuclear fusion technology has intensified this year,