The unnamed source said that “army units established control over Maratt al-Fouqa town to the east of the Euphrates River, and encircled IS terrorists in al-Mayadeen,” in eastern Syria.

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RIA Novosti also reported that the Syrian Army has encircled IS in Al-Mayadeen, 45 kilometers southeast of Deir ez-Zor.

“Assault detachments of the army are conducting clearance operation on the western outskirts of Mayadeen,” RIA reported, citing its military source on the ground.

On Thursday, the Russian Defense Ministry said two submarines from the Russian Black Sea Fleet launched cruise missiles strikes on Al-Mayadeen.

The defense ministry said in a statement that two Russian submarines, the Veliky Novgorod and the Kolpino, delivered strikes from the Mediterranean Sea by 10 Kalibr cruise missiles on IS sites in the area surrounding Al-Mayadeen.

“By means of objective control, destruction of all assigned targets has been confirmed,” Russian Ministry of Defense Spokesman Major-General Igor Konashenkov said. “IS rebel groups in the area of the settlement of Mayadeen received significant damage both in manpower and technology,” he added.