Hundreds of Ukrainian police began storming a protest encampment in central Kyiv early Wednesday, clashing with anti-government demonstrators and ripping down their makeshift tent city.
Witnesses quoted by Reuters said a Ukrainian singer on stage at the huge encampment used a loudspeaker to urge police not to carry out their orders and not to harm protesters.
The crackdown unfolded hours after European Union foreign policy chief Catherine Ashton and U.S. Assistant Secretary of State Victoria Nuland met in the capital with senior government and opposition leaders in a push to ease the crisis.
Earlier Tuesday, Ukrainian President Viktor Yanukovych met with three former Ukrainian presidents, launching so-called round table talks reportedly aimed at the same objective.
The protests began in late November, after the Ukrainian president backed away from a long-anticipated trade deal with the European Union, in favor of repairing and improving economic and political ties with Russia.
In a nationally televised address Tuesday following his meeting with his predecessors, Mr. Yanukovych called for the release of protesters arrested after a violent police crackdown November 30. He said good relations with both Russia and the European Union are necessary to protect the country's interests.
"I am strongly against opposing relations with Europe in favor of relations with Russia and vice versa. We need to find a way to reunite. I think Europe will sleep peacefully in warmth if Ukraine has good relations with Russia, if there are no such conflicts like when we were shut off from gas. This is unacceptable, so we need to protect our own interests.''
Moscow is seeking to form a trade bloc of former Soviet republics and satellite countries to rival the European Union, and has in recent months exerted strong economic pressure on its impoverished neighbor to scuttle the EU deal.
Earlier this year, it imposed restrictions on goods from Ukraine, cutting Ukrainian exports by 25 percent and dragging the country into recession.
Russia is Ukraine's largest foreign investor, trading partner and chief natural gas supplier. Moscow is reported to be dangling a deal with Ukraine that includes a $9 billion annual discount on gas pipeline shipments.
Analysts say Kyiv, which has also secured recent investment deals with China, still needs about $18 billion in outside help to pay government debt and meet energy payments to Russia by early 2014.