REUTERS

"The letters with appropriate warnings have already been sent," the reports says.

As UNIAN reported earlier, on September 25, Ukrainian Prime Minister Arseniy Yatsenyuk announced that in keeping with National Security and Defense Council decisions, Ukraine's Cabinet of Ministers had decided to toughen anti-Russian sanctions by banning flights carried out by Russian airlines, namely Aeroflot and Transaero. Ukraine also banned transit flights of Russian airlines through Ukrainian airspace "if they carry defense goods, dual-purpose equipment, or Russian military personnel," the press service said quoting Yatsenyuk who announced this decision at a recent Cabinet meeting.

Read alsoRussia ready to respond with retaliatory measures against two Ukrainian airlinesOn September 16, Ukrainian President Petro Poroshenko enacted a decision taken by the National Security and Defense Council on September 2 to introduce sanctions against about 400 individuals and more than 90 entities from the Russian Federation and other countries, who are involved in the annexation of Crimea and aggression in Donbas.

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