Who is attacking Russia’s bases in Syria? A new mystery emerges in the war.

https://www.washingtonpost.com/amphtml/world/who-is-attacking-russias-main-base-in-syria-a-new-mystery-emerges-in-the-war/2018/01/09/4fdaea70-f48d-11e7-9af7-a50bc3300042_story.html