 On 26 November, a spokesman for the Interior Ministry of Ukraine, Artem Shevchenko, said that the Interior Ministry had no criminal proceedings against Firtash, but there was a proceeding for the Ostchem group in which he was summoned as a witness.On 28 November 2015, the head of the Ukrainian airspace administration instructed that airspace be closed to private aircraft, to prevent Firtash from returning.On 1 December, Firtash said that the Ukrainian government took unprecedented steps to disrupt his visit to Ukraine.