One national guard member has been killed and about 100 injured outside Ukraine’s parliament, after MPs gave initial backing to reforms for more autonomy in the rebel-held east.
National guardsmen were pelted with fire crackers and petrol bombs as explosions were heard.
MPs had just voted in a rowdy session to approve more powers in areas of Donetsk and Luhansk under control of pro-Russian rebels.
A fragile ceasefire is in place.
Pushing through greater autonomy for the rebel-held areas is a key part of the Minsk deal, originally signed in February.
During the summer fighting between Ukrainian army forces and the rebels has escalated. But the two sides agreed last week to halt the violence on 1 September, the day children in the region return to school.