US, Russia, Iran draw new red lines in Syria

On June 18, 2017, a United States Navy F/A-18 Super Hornet shot down a Syrian Su-22 warplane after it dropped bombs near the Syrian Democratic Forces, a US-backed partner group. The incident marked a rare air-to-air kill of a manned aircraft by US forces. It followed several weeks of escalating confrontations between Syrian pro-regime militias and US-backed forces, including the previous downing of an Iranian Shaheed-129 drone.

In response to the shootdown, Russia announced it had suspended the use of a key communication channel established with the United States to prevent midair conflicts over Syria. Russia has provided air cover for the forces of Bashar Al-Assad since 2015, utilizing an S-400 air defense system stationed at the Latakia Airbase on the Syrian coast. The US military had previously used the communication line to warn pro-regime forces to remain clear of coalition and partner forces near Raqqa, Tabqa, and a training facility in Tanf.

The military actions occurred amid broader clashes near a village where the Syrian regime and US-allied Kurdish forces confronted one another following the collapse of Islamic State control in a nearby town. White House spokesman Sean Spicer stated that the escalation of hostility among the factions operating in the region did not help anyone.

According to US officials at the time, the Trump administration remained divided over its long-term strategy. Some officials prioritized the destruction of the Islamic State under Operation Inherent Resolve, while others viewed the conflict as an existential struggle between the United States and its Gulf allies on one side, and Iran on the other.