‘Practically every home in Pankisi bears the scars of the Second Chechen War, the Abkhazian War and the Syrian War. Practically every home has ties to the Islamic State.’ In this excerpt from her book ‘Goodbye, Isis: What Remains is Future’, Kateryna Sergatskova travels to the birthplace of Tarkhan Batirashvili, aka Omar al-Shishani, the former IS ‘Minister of War’.