Refat Chubarov, leader of the Crimean Tatar national movement in Ukraine and worldwide signs a condolence book as a sign of mourning in front of the list of victims of the attack at a vocational school in Kerch in Crimea, shown in a Crimean House in Kyiv, Ukraine, October 18, 2018. According to reports, 18-year-old gunman student, Vladislav Rosliakov, committed suicide after killing about 20 students and teachers and injuring 74 others during the attack at the school in Kerch, October 17, 2018.