Syria: Which countries have been involved in the war and why? - BBC.com
- Syria: Which countries have been involved in the war and why? BBC.com
- What to Know About the Countries Still Fighting in Syria After al-Assad’s Ouster The New York Times
- ISIS, refugees, populism: How Syria changed everything Axios
- How the Syrian rebels’ surprise offensive shocked the world Vox.com
- What Happens Next in Syria? The Wall Street Journal