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The sub was 20 kilometers from the Admiral Kuznetsov aircraft carrier at the time of the incident, the military said, according to BBC News.

Russia sent a flotilla to the eastern Mediterranean ahead of an expected resumption of air strikes in Syria.

Read alsoThe Sunday Times: Russia sends subs to SyriaNATO said it was monitoring the ships in a "measured and responsible way".

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An official said the Western military alliance would not go into details but said it had been observing the fleet for some weeks.