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WASHINGTON — A Russian fighter jet flew within 10 feet of a U.S. Navy surveillance aircraft, in what American officials called an unsafe intercept over the Black Sea, the Pentagon said Wednesday.

Navy Capt. Jeff Davis, a Pentagon spokesman, says the Russian SU-27 Flanker fighter made the unsafe maneuver Wednesday near a U.S. Navy P-8A Poseidon aircraft that was conducting routine operations in international airspace.

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Russian Defense Ministry Spokesman Maj. Gen. Igor Konashenkov said in a statement Wednesday that the Poseidon aircraft did not have its transponders turned on, and that it approached Russia's southern border twice.

A Russian SU-27 fighter flies over the sea off the Japanese island of Hokkaido in 2013. AP file

He said Russian jets were deployed to intercept the incoming aircraft and "Russian pilots acted in strict compliance with international flight rules."

A senior U.S. defense official said the Navy Poseidon had its transponder turned on during the entire flight. The official was not authorized to discuss the matter publicly so spoke on condition of anonymity.

According to the U.S., the Russian jet conducted four intercepts of the Poseidon, and the one that was considered unsafe lasted about 19 minutes.

Davis said that U.S. Navy aircraft and ships routinely interact with Russian units in the area and most interactions are safe and professional.

"However, we have concerns when there is an unsafe maneuver like this," he said. "These actions have the potential to unnecessarily escalate tensions, and could result in a miscalculation or accident. "

Russian jets have occasionally flown close to other U.S. aircraft and Navy ships in the region. In one more dramatic incident earlier this year, Russian jets buzzed over the USS Donald Cook in the Baltic Sea, coming within 30 feet of the warship.