Vladimir Donsov, Associated Press
Police officers carry their injured colleague after grenade exploded during a clash between protesters and police after vote to give greater powers to the east, outside the Parliament, Kiev, Ukraine, Monday, Aug. 31, 2015. The Ukrainian parliament has given preliminary approval to a controversial constitutional amendment that would provide greater powers to separatist regions in the east. Hundreds of people gathered in front of the parliament to protest against the amendment.

KIEV, Ukraine — A right-wing party says it is leaving Ukraine's ruling parliamentary coalition because it's opposed to a constitutional amendment that would give greater powers to the rebel-held eastern region.

The Radical Party of Oleh Lyashko, which came in fifth in last year's election, said Tuesday that it is leaving the coalition and calling for a national referendum on the amendment.

Three people died in clashes between nationalists and police outside Ukraine's parliament on Monday after a vote to give more powers to the regions, including the east.

Ukrainian nationalists strongly oppose the measure, fearing it would threaten the country's sovereignty.