According to him, the most complicated situation is now in Aleppo.
"Militants are using the ceasefire and the fact that the army is not responding to shelling. In areas they control militants move personnel and equipment at daytime and nighttime," he added.
Earlier, the Russian Defense Ministry said that the US failed to fulfill obligations of the deal.
Lt. Gen. Viktor Poznikhir, the first deputy chief of the Main Operational Directorate of the Russian General Staff, added that the number of ceasefire violations by Syrian rebel groups had been steadily on the rise since the truce came into force last Monday.
The moderate opposition groups are using the truce to reinforce and regroup on the battlefield, former Pentagon official Michael Maloof said.
"I think what’s happening on the ground is that the so-called moderates that the US supports are vying for more positions of strength. They are using the lull and the ceasefire to regain battlefield positioning. They want to take Aleppo. This is going to continue on. This has been spurred from the outside," Maloof told RT.
Maloof also pointed out that there are two serious problems with attacking terrorists. First, it is very difficult to separate the so-called moderates from al-Nusra Front. Second, Washington does not have leverage over the moderate forces.
He also said that Washington should provide all necessary information to Russia as well as declassify the US-Russian agreement on Syria.