France tested an upgraded nuclear-capable missile from a submarine, the article reports.

The French Navy fired the M51.3 from the Le Vigilant SSBN for the first time.

Officials framed the acceptance firing as proof the national deterrent remains credible.

The launch came amid heightened Russia tensions and European security worries.

The Kremlin called the test part of a dead-end anti-Russia strategy.

Defense News and Naval News tracked the milestone underwater launch.

Paris says modernization programs comply with international arms-control obligations, according to coverage in the article.

Diplomats expect fallout to linger as Europe weighs the deterrence signal.

Read the full article for more details on France's submarine missile test.