The meeting reportedly involved a discussion of what forces were position around the eastern Syrian city of Deir ez-Zor, which is expected to be where ISIS makes its last stand against the US - and Russian-backed coalitions with which it is now at war.
US-backed Syrian fighters captured the country's largest gas field from the Islamic State of Iraq and the Levant (ISIL) group in an eastern province that borders Iraq as they race with government forces to capture the energy-rich region, a senior official with the group said. "Fire points in those areas will be immediately suppressed with all military means".
The assaults by the Russian-backed Syrian army and the USA -backed SDF have at times raised fears of clashes that could stoke tensions between the competing world powers.
The convergence of the rival offensives has increased tensions in Deir al-Zor. However, the SDF, the Kurdish-dominated militia that the USA military created and has supported as the only "viable" force to fight ISIS, seems to have other ideas. Russian drones did not detect any clashes between the two groups when SDF fighters approached Deir al-Zor, he said.
Nasser Haj Mansour of the Syrian Democratic Forces said the Conoco gas field and plant came under full control of the group Saturday morning after days of fighting with the extremists.
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Syrian troops on Monday crossed to the eastern side of the river where the SDF, an alliance of Kurdish and Arab militias fighting with the US-led coalition, has also been advancing.
According to the statement, the Syrian government troops "continued their offensive operation" to destroy the last "ISIS bridgehead" near the city of Deir Ezzur, the provincial capital.
"This is the first gas or oil field in the campaign which we have liberated", he said.
Following Damascus's strategic victory, food, medicine and other essentials started to reach the city by convoy, where previously the inhabitants had to rely on air-drops.