Vital maritime corridor closes after 90 vessels – including shadow fleet oil tankers – are attacked in under a week Russia has been forced to suspend shipping in the Sea of Azov after 90 vessels were targeted by Ukrainian drones in less than a week. Ukraine’s drone forces chief, Robert Brovdi, said on Sunday that his units had hit 10 tankers and four ferries overnight, as well as a major oil refinery in the city of Syzran. There were multiple strikes on electricity sub-stations in occupied…