Deep in the freezing waters of the North Atlantic, NATO is preparing for a war that would unfold almost entirely in silence.

NAPLES, Italy — A U.S. Navy destroyer is operating in the Baltic Sea as part of a NATO mission that is adding air defense to its underwater focus as the alliance confronts repeated unidentified drone ...

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German and Swedish fighter jets were scrambled to intercept a Russian reconnaissance plane that entered neutral airspace over the Baltic Sea on Sunday morning, officials from Germany and Sweden said.

Conflicts between NATO-backed Ukraine and Russia have taken on a new dimension in recent weeks with attacks on civilian commercial vessels in the Black Sea. That the attacks occurred not only in ...