Interior Ministry says more than 70 people detained since midday Sunday . At least 4 people killed , says head of protest movement medical service . In December , despite weeks of protest by anti-government demonstrators , Yanukovych agreed to a deal with Russian President Vladimir Putin for Moscow to buy Ukrainian debt and slash the price Kiev pays for its gas . - The government announces it will allow the opposition to hold a referendum on constitutional reform in November. The clashes are an escalation of weeks of largely peaceful anti-government protests .
Interior Ministry says more than 70 people detained since midday Sunday . At least 4 people killed , says head of protest movement medical service . - The government announces it will allow the opposition to hold a referendum on constitutional reform in November. The clashes are an escalation of weeks of largely peaceful anti-government protests .