Ukraine has suffered 18 months of turmoil since pro-Russian president Viktor Yanukovych was ousted in a popular revolt last year, an event that set in train a separatist insurgency in the industrial east.
Agence France-Presse: Key dates in Ukraine since Yanukovych ouster
Activists of radical Ukrainian parties, including the Ukrainian nationalist party Svoboda (Freedom), clash with police officers in front of the parliament in Kiev on Aug. 31, 2015.
