The Russian air force bombarded the terrorists' bases in hard-to-reach mountainous areas of Deir ez-Zur.
Yurii Popov, the deputy head of the Russian Defense Ministry's Center for Reconciliation of Opposing Sides in Syria, said that the anti-terrorism operation was carried out in the Mount Bishri area.
According to the 2017 agreement among Iran, Russia, and Turkey as the guarantor countries of the Astana Peace Talks, four safe zones were established in Syria.
Three regions came under the control of the Syrian army in 2018, but the fourth region, which includes Idlib province in northwestern Syria and small parts of Latakia, Hama, and Aleppo provinces, is still under the control of terrorist groups and adversary groups.
At the end of the summer of 2018, the leaders of Russia and Turkey reached an agreement in Sochi, Russia, during which Turkey promised to remove or disarm the terrorists based in this region without bloodshed.
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