NEW : Memorial service for soldiers killed in clash last week . Defense minister says he will not get involved in political conflict . Opposition leaders demand president 's concessions . Klitschko 's party , the Ukrainian Democratic Alliance for Reforms , warned on Saturday that authorities are preparing to provoke peaceful protesters and may plant provocateurs among the crowds in an effort to enact emergency rule . Kiev rocked by ongoing clashes between protesters and police .
NEW : Memorial service for soldiers killed in clash last week . Defense minister says he will not get involved in political conflict . Opposition leaders demand president 's concessions . Kiev rocked by ongoing clashes between protesters and police .