Russia’s Deepening Military Involvement in Syria

Russia’s deepening military involvement in Syria, Washington’s decision to extend its military presence in the northeast of the country, and Russia’s recently declared intention to transfer S-300 surface-to-air missiles to Syria further complicate the operational environment for U.S. forces and allies in the region. What are the implications of these developments for ongoing U.S. military operations in the Levant, ties, U.S. involvement in Syria and Iran, as well as for U.S. regional allies?