The establishment of Austro-Hungarian rule over Bosnia and Herzegovina eventually reached its apex with the country's formal annexation in 1908. Meanwhile, the May Coup in Kingdom of Serbia had led to a rise in Yugoslav nationalism in the Balkans. This culminated with the establishment of Young Bosnia, a revolutionary organization dedicated to the unification of Bosnia and Herzegovina with Serbia. The group's ideological leader was Vladimir Gaćinović, who was inspired by anarchists of the Russian diaspora, including the works of Mikhail Bakunin and Peter Kropotkin, as well as the actions of the Narodnaya Volya organization. He proposed propaganda of the deed in the form of tyrannicide, as a method of revolutionary political struggle to achieve Bosnian national liberation. These ideas were first put into practice by Bogdan Žerajić, himself also a supporter of Kropotkin's ideas, who attempted to assassinate the Governor of Bosnia and Herzegovina Marijan Varešanin, but failed and subsequently committed suicide.