A total of 236 MPs voted for the ratification of the deal at a parliament session on Tuesday.
Though the ratification did not go easily. Supporters of different political forces surrounded the building of the parliament.
About 7,000 protestors and supporters gathered in front of the parliament, according to police estimates. Ukrainian opposition parties said some 10,000 of its activists will take to the streets, the pro-presidential Party of Regions said it would gather some 5,000 supporters.
Ukrainian police and the country's opposition briefly clashed in front of the Supreme Rada as opposition members tried to get through into the parliamentary building. The attempt was suppressed by police.
Supporters of the incumbent president, Viktor Yanukovych, who set up a tent city around the Supreme Rada ahead of the hearings, welcomed the ratification by chanting: "Yanukovych! Yanukovych!"
Their political opponents responded by chanting: "Shame! Shame!"
The two rival groups are currently separated by a police cordon.
Opposition activists demonstrated aggressive behavior, constantly shouting "Down with Yanukovych!" "Down with [his] gang!" The Party of Region supporters have remained calm.
Activists of Ukrainian nationalist movement "Svoboda" (Freedom) are trying to break police cordons, and are throwing plastic bottles at police officers.
No casualties have been reported so far, though sporadic fights between the political adversaries have broken out, however they were quickly suppressed by the country's riot police.
Inside the session hall someone threw several smoke bombs.
Before speaker Volodymyr Lytvyn could announced the begining of vote for the ratification of the agreement on Russian Black Sea Fleet, he was hit with boiled eggs. Deputies tried to protect the speaker with open umbrellas. MPs from the Party of Regions and BYuT started a fight.
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