"In the eastern part of Syria, in the territory controlled by the US-led coalition, the activities of radical groups have intensified," RIA Novosti quoted him as saying.
He noted that over the past week, coalition targets in Trans-Euphrates were fired on by these groups four times.
“On July 11, militants fired at coalition targets in the areas of the Konoko and Al-Omar oil and gas fields using homemade multiple launch rocket systems,” Kulit added.
On June 29, US forces opened artillery fire in response to a missile attack on a US base in Syria.
On the evening of June 28, a US military base near the Al-Omar field in the east of the Syrian province of Deir ez-Zor was fired upon by rockets.