"The Russian Federation continues to incur losses in Syria. It was established that the bodies of six Russian soldiers had been delivered in Luhansk," the report says.

According to the office, the military signed a contract for participation in hostilities in Syria on the side of the regime of Bashar al-Assad.

Read alsoBodies of 26 Russian marines killed in Syria brought back to Sevastopol: Ukrainian IntelligenceAs reported earlier, Russian jets dropped 1,920 bombs on targets in Syria in the past four days.