USA -backed coalition forces shot down a pro-Syrian regime fighter jet on Sunday after it bombed the Syrian Democratic Forces-held town of Ja-Din, the coalition said.
The US-backed Syrian Democratic Forces (SDF) launched a new attack in the western Al-Raqqa, targeting the southeastern countryside of Tabaqa.
"Following the Pro-Syrian forces attack, the coalition contacted its Russian counterparts by telephone via an established "de-confliction line" to de-escalate the situation and stop the firing", said a statement from Operation Inherent Resolve, the US -led coalition fighting ISIS.
Coalition aircraft in a show of force stopped the initial advance.
Before it downed the plane, the coalition had "contacted the its Russian counterparts by telephone via an established "de-confliction line" to de-escalate the situation and stop the firing".
Branding the action as flagrant aggression, the Syrian army said the downing of the Syrian war jet by the USA coalition is an evidence on the supportive role of the U.S.to the terror groups.
The U.S. move proves that Washington has redlines for the Syrian army to stay away from, as such areas including near the Iraqi borders and Raqqa are the share of the U.S. -backed forces.
A Syrian army statement released on Syrian state television said the plane crashed and the pilot was missing.
Tanf is a key town on the Iraq-Syrian border that has been home to a U.S. Special Operations training outpost for months.
A few hours later, the Syrian SU-22 dropped bombs near SDF fighters and, "in collective self-defense of coalition-partnered forces", was immediately shot down by a U.S. F/A-18E Super Hornet, the Pentagon said.
"The demonstrated hostile intent and actions of pro-regime forces toward coalition and partner forces in Syria conducting legitimate counter-ISIS operations will not be tolerated", it added.