MOSCOW, June 6. /TASS/. Russian warplanes delivered air strikes on Islamic State oil production facilities as part of their mission of undermining the economic base of that terrorist organization in Syria, the Russian center for reconciliation of the warring parties in Syria said in its regular daily news bulletin posted on the Russian defense ministry’s website on Monday.

"Warplanes of the Russian air group destroyed four illegal oil production facilities located in the provinces of Raqqa and Homs," the bulleting said.

Last week, Russia’s Su-34 bomber delivered a strike on an oil refinery near the settlement of Ras al-Ayn in Syria’s province of Al-Hasakah and destroyed an oil reservoir. Earlier, Russian warplanes destroyed several more illegal oil production facilities controlled by Islamic State in the province of Raqqa.

Five ceasefire violations reported in Syria in past day

The ceasefire regime has been generally observed in most of Syria’s provinces, with five violations reported in the province of Damascus in the past day, the Russian center for reconciliation of the warring parties in Syria said/

"Units of the Jaysh al-Islam group which aligns itself with the opposition conducted fire from multiple missile launcher systems and mortars at positions of the Syrian government army in the settlements of Ain Terma, Jaur al-Basha, Mazraat Mahmoud. The settlement of Harasta came under shelling twice during the day," the center said.

Reconciliation agreements were signed with representatives of two settlements in the provinces of Damascus and Homs. Thus, the number of settlements joining the reconciliation process has reached 136, as follow from the bulletin.

"The number illegal armed groups that declared their commitment to the ceasefire terms remains unchanged - 60," the bulletin said.

A ceasefire regime brokered by Russia and the United States on February 22 officially came into effect in Syria at midnight Damascus time on February 27. This does not cover terrorist groups such as Islamic State and Jabhat al-Nusra, both outlawed in Russia, and other groups recognized as terrorist by the United Nations Security Council.