Iran lobs a ballistic missile into Syria targeting terrorists to avenge attacks inside their country recently - https://www.rt.com/news/392940-iran-...issiles-syria/

Then the US and co shot down a Syrian government warplane in Syria - https://www.rt.com/news/392941-us-le...-syrian-plane/

From the second link: The downing of the Syrian warplane, an Su-22, was confirmed by an official press statement from Operation Inherent Resolve, the US-led international task force against IS, which accused the Syrian government of targeting fighters from the Syrian Democratic Forces, a Kurdish-led militia.

“At 6:43pm, a Syrian regime SU-22 dropped bombs near SDF fighters south of Tabqah and, in accordance with rules of engagement and collective self-defense of Coalition partnered forces, was immediately shot down by a US F/A-18E Super Hornet,” the statement read.

That statement omits to say they have no legal authority to be in Syria!