Top Western diplomats headed to Kiev on Tuesday to try to defuse a stand-off between President Viktor Yanukovych’s government and thousands of demonstrators, following a night in which police in riot gear dismantled protesters’ encampments outside government buildings.

Demonstrators have occupied the Ukrainian capital for weeks opposing Mr. Yanukovych’s decision to freeze ties with the European Union and tilt to Russia instead.

Riot police in full gear flooded Kiev, confronting protesters through the night on snow-slicked streets, while a leading opposition party said heavily armed security forces broke into its offices and seized computer servers.

Mr. Yanukovych planned to meet on Tuesday with Ukraine’s three former Presidents in a search for a resolution to the crisis.

An opposition leader, Oleh Tyanhybok, was quoted by Ukrainian media as saying several protesters were injured in one of the confrontations, in which police tore down small tent camps locking access to government buildings.

There were no immediate official figures on injuries, but the incident appeared to be less violent than the club-swinging police dispersals of demonstrators a week and a half ago that galvanized anger.

The police moves were against encampments set up after Sunday’s rally and no action was taken against the extensive main camp on Kiev’s central Independence Square, where crowds gather around the clock.

The protests, in their third week, started after Mr. Yanukovych backed away from signing an agreement on deepening ties with the European Union, a pact that many Ukrainians desired in order to tilt West and lessen Russia’s influence on the former Soviet republic.

Police violence against those demonstrations outraged many and drove hundreds of thousands of people into the streets the past two Sundays, turnouts perhaps larger even than the mass protests of the 2004 Orange Revolution that forced a rerun of a fraudulent presidential election.

On Sunday protesters also toppled a landmark statue of Soviet leader Vladimir Lenin in a symbolic defiance of Russian influence.

EU foreign policy chief Catherine Ashton and U.S. Assistant Secretary of State Victoria Nuland were expected in Kiev on Tuesday, set to meet with Mr. Yanukovych and the opposition.

Mr. Yanukovych was also due to meet his three predecessors, including Viktor Yushchenko, who defeated Mr. Yanukovych in the election forced by the 2004 protests, and Leonid Kuchma, who as President opted against the use of force against Orange Revolution demonstrators.

The night-time confrontations were tense and angry, but the rally on Independence Square retained an incongruous air of merriment. Hyperenergetic pop star Ruslana led an aerobic dance routine to warm the demonstrators against the minus 5 C freeze and servers with trays of hot tea passed through the crowd.

Yesterday night, Ostap Semerak of the Fatherland Party, told The Associated Press that troops broke into the party’s offices, some climbing in through its windows.

The troops left after confiscating some computer equipment, he said. An Associated Press reporter later saw broken glass and smashed computers in the offices.

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