The Krasnodar, a Russian attack submarine, left the coast of Libya in late May, headed east across the Mediterranean, then slipped undersea, quiet as a mouse. Next, it fired a volley of cruise missiles into Syria.
In the days that followed, the diesel-electric sub was pursued by the aircraft carrier USS George H.W. Bush, its five accompanying warships, MH-60R Seahawk helicopters and P-8 Poseidon anti-sub jets flying out of Italy.
The U.S. and its allies had set out to track the Krasnodar as it moved to its new home in the Black Sea. The missile attack upended what had been a routine voyage, and prompted one of the first U.S. efforts to track a Russian sub during combat since the Cold War. Over the next weeks, the sub at points eluded detection in a sea hunt that tested the readiness of Western allies for a new era in naval warfare.
An excellent article from the Wall Street Journal. Articles on their website are behind a paywall, but the article is available at the following link, for free. I don't know how long the link will work.
Full Article