Trump's nuclear submarine positioning represents significant escalation in deterrence strategy amid rising tensions with Russia and China's expanding nuclear arsenal.

"Rhetoric sometimes turns into action in unpredictable ways," a former senior U.S. arms control official told Newsweek.

American nuclear forces consist of ballistic missile submarines, land-based intercontinental ballistic missiles, and bomber ...

The Project 955A Borei-class ballistic missile submarine Knyaz Pozharsky entered service less than two weeks ago.