Prime Minister Narendra Modi on Thursday condoled the demise of former Soviet leader Mikhail S Gorbachev, and said he was one of the leading statesmen of the 20th century who left an indelible mark on the course of history.Gorbachev died at a hospital in Moscow on Tuesday at the age of 91 after a “serious and prolonged illness”, according to the Russian media. His death prompted an outpouring of condolences and tributes from leaders across the world.”I extend our deepest condolences