And Iran's missile strikes in response to the recent ISIS terrorist attack in Tehran sent another signal that they plan to be players in eastern Syria. They are making their way through the outskirts of Raqqa, backed by US -led coalition airstrikes. Syrian government and allied troop.
Coalition forces are using the Al-Tanaf base by Syria's borders with Jordan and Iraq to train anti-jihadist Syrian fighters and stage attacks against IS.
They are attempting to become an indispensable player in uprooting the extremists from Syria entirely. That's a questionable line of argument, particularly as unlike the recent strikes around al-Tanf, there's no indication that there was a USA troop presence nearby-only Kurdish SDF forces.
The end result is not a chastened Syria and an Iran that's afraid to get into a fight with an unpredictable president but instead an adversary that will continue to probe US tolerance and may at some point go too far, triggering a major conflict that nobody wants. Chris Murphy of CT warned Tuesday that the United States could be edging toward a military conflict with Iran and Russian Federation in Syria. Russian Federation also vowed to meet additional strikes against Syria with force.
"There's no authorization for military force that Congress has passed that gives the president the ability to take military action against the Syrian regime", said the senator, a member of the Senate Foreign Relations Committee.
The official said the USA pilot saw the Syrian pilot eject and saw a parachute deploy, but the USA believes the pilot would have landed in ISIS-controlled territory in Syria.
Jennifer Cafarella, of the Institute for the Study of War, said the USA strikes are unlikely to deter Mr Assad and his backers.
The United States, he added, "is dealing with it defensively and reactively".
Trump may decide he doesn't want to commit USA ground forces to that struggle.
Iranian drones have been flying fairly regularly over southern Syria and Syrian aircraft have begun to venture there as well.
"In accordance with rules of engagement and in collective self-defence of coalition-partnered forces, [the Syrian jet] was immediately shot down by a US F/A-18E Super Hornet", a coalition statement read.
U.S. central command claimed the jet had dropped bombs near the US-backed Syrian Democratic Forces and had been shot down "in collective self-defense". This effort to work with partners, however, doesn't mean that the US won't down Syrian aircraft if necessary.
The drone was downed just outside the 55 kilometer de-confliction zone, according to the officials.
The drone was thought to be armed and threatening US-led coalition troops on the ground, officials said.
The global coalition led by the United States was hit by Syrian drones, CNN reported. It is the second Iranian drone shot down by the U.S.in less than a month.
Australia has said it will resume its military air operations over Syria.
"We are heading toward a bare-knuckle fight, which is likely to be in favor of the Russia-Iran-Syria axis", he said. Apparently, Russia thinks it will work now that the US president is Trump and the stakes are controlling every strategically important part of Syria. Although he lacks the manpower and capability, Assad still dreams of recapturing all of Syria and returning to the days prior to the civil war.
On Tuesday, Russian Deputy Foreign Minister Sergei Ryabkov accused the USA of "open collusion with terrorists" in Syria. But Iran can do that through proxies, and Assad can do it knowing the United States won't advance west toward Damascus.
The alternative would be for the Americans to try to do it themselves, either with the Kurdish-led forces - who are unpopular in the largely Arab tribal areas - or by creating a new force while remaining in the area until it is formed.
These Iran hawks, they said, are pushing for a Syria strategy that calls for concentrating first on defeating the IS, then turning on Iran and its allies, including Mr Assad, Lebanon's Hezbollah, Iraq's Shia militias, and Houthi rebels in Yemen.