Pentagon sources report on the operation being prepared by Russian military, CNN TV channel reports. According to the representative of the US defense establishment, the ground combat elements are setting at ready, and they can attack the opposition forces.

The artillery has been seen between the cities of Homs and Idlib. The CNN sources clarified that the ground armament consists of artillery and four units of BM-30 ‘Smerch’ multiple-launch rockets.

Earlier, Valentina Matvienko, the speaker of the Federation Council, said that Russian troops would not participate in ground operations in Syria.