Kremlin Awaits Bulgaria's Explanation on Airspace Closure
![Kremlin Awaits Bulgaria's Explanation on Airspace Closure](http://cdn5.img.sputniknews.com/images/102575/20/1025752056.jpg)
Moscow is waiting for explanations from Sofia following the closure of the Bulgarian airspace for Russian transport planes carrying humanitarian aid to war-torn Syria, Kremlin spokesman Dmitry Peskov said Tuesday.