The political crisis escalated when the Serb-populated areas attempted to form an enclave called Serbian Krajina which intended to separate from Croatia if Croatia itself attempted to separate from Yugoslavia. The Serb leadership in Krajina refused to recognize the government of the Republic of Croatia as having sovereignty over them. The crisis began in August 1990 with the Log Revolution as Croatian Serbs cut down trees and used them to block roads. This hampered Croatian tourism and caused alarm in the province of Dalmatia as Croatia was hosting the 1990 European Athletics Championships in Split.