Yesterday Iraq without any explanation closed its airspace to Russian military aircraft flying from Iran to Latakia.
The plane was forced to turn back to Iran.
No other explanation except explicit demonstration partners.
Russian leaders make it clear that, if necessary, the Russian military group in Syria is tightly blocked, and then the evacuation will be possible, only breaking to her with the battle.
Either leave in the lurch.
When Putin started the war in Syria, such issues are not too interested in – it arrows painted on the Galaxy map, where the scale is too small for such nuances.
Theoretically, there are routes that allow to reach Syria even in this case, but they look, say, too exclusive.