Iranian President Ebrahim Raisi has crashed in a helicopter in East Azerbaijan province. The sudden death has changed speculation about the successor to Supreme Leader Ayatollah Ali Khamenei, who is 85 years old and whose health has long been in the spotlight. RBC-Ukraine reports who Raisi was, why he was nicknamed ‘Butcher of Tehran’, and whether his death will affect the ruling regime. Sources: Reuters, Sky News, The Atlantic, Iranian media, as well as comments by Ilya Kusa, an analyst at the Ukrainian Institute for the Future. Contents Details about Iranian president’s deathWho was Raisi an…