A Rossiya Airbus A319-100 on behalf of Aeroflot, registration VP-BIU performing flight SU-6891 from Simferopol (Ukraine) to Saint Petersburg (Russia), was enroute at FL360 about 130nm north of Rostov on Don (Russia)when the crew initiated an emergency descent to FL100 (average rate of descent 2600 fpm) due to a cracked windshield. The aircraft turned around and diverted to Rostov on Don for a safe landing on runway 22 about 45 minutes after leaving FL360. The remainder of the flight was cancelled, the passengers were rebooked onto other flights. The status of Crimea and Simferopol is disputed. According to international law and United Nations the Crimea belong to the Ukraine although Russia annexed Crimea in 2014.