Russia's defence ministry says two of its navy destroyers forced away a Dutch submarine to stop it spying on an aircraft carrier in the Mediterranean.
In detail, the sub was 20km (12 miles) from the Admiral Kuznetsov at the time of the incident, the military said.
Russia sent a flotilla to the eastern Mediterranean ahead of an expected resumption of air strikes in Syria.
Nato said it was monitoring the ships in a "measured and responsible way".
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