外交関係に関するウィーン条約
On 26 August 2015, a treaty was signed between Russia and Syria that stipulated terms and conditions of use by Russia of Syria's Hmeimim airport, free of charge and with no time limit. The treaty, ratified by Russia′s parliament in October 2016, grants Russia′s personnel and their family members jurisdictional immunity and other privileges as envisaged by Vienna Convention on Diplomatic Relations.