South East Airlines (Makhachkala) has been forced to suspend operations by the Russian civil aviation authority on December 17. It had operated a fleet of nine Tu-154Ms and four Tu-134s on scheduled services from Makhachkala in the Dagestan region of Russia to Istanbul Sabiha Gökcen, Moscow Vnukovo and St. Petersburg as well as charter services. After a crash of one of its aircraft at Moscow Domodedovo in December 2011, it had been instructed to improve its safety standards and according to statements made by the authorities had been found to be not following these guidelines leading to the cancellation of its air operator certificate now.