Ukrainian
former Prime Minister Yulia Tymoshenko has urged opposition supporters
in Kiev's Independence Square to continue their protests.
Ms Tymoshenko, who has a back injury, addressed crowds from a wheelchair after being freed from detention."Until you finish this job... nobody has the right to leave," she said.
Her speech came at the end of a dramatic day that saw President Viktor Yanukovych removed by MPs and fleeing Kiev, but refusing to stand down.
Ms Tymoshenko broke down in tears as she told cheering supporters late on Saturday: "You are heroes.
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Yulia Tymoshenko
- 1960 - Born in Dnipropetrovsk, eastern Ukraine
- 1990s - runs United Energy Systems of Ukraine and makes a fortune
- 2004 - "Orange Revolution" protests led by Tymoshenko and ally Viktor Yushchenko defeat Viktor Yanukovych
- 2005 - Tymoshenko becomes PM but relations sour with President Yushchenko
- 2010 - Yanukovych beats her in presidential election
- 2011 - Jailed for for abuse of power
- February 2014 - Freed after three months of anti-government protests
"Because nobody could... do what you have done," she said. "We've eliminated this cancer, this tumour."
But while she was hailed by many in the audience, she does
not enjoy universal support among the opposition, says the BBC's David
Stern in Kiev.Before she went into prison in 2011, her popularity ratings were dropping and many Ukrainians blame her in part for the chaos of the post-Orange Revolution years, or see her as a member of Ukraine's corrupt elite.
Dozens of people walked away in disgust when she appeared on the stage, the BBC's Tim Wilcox in Independence Square reports.
A vote by parliament on Friday paved the way for her release.
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Duncan Crawford on mixed reactions in the crowd as Tymoshenko spoke
Earlier on Saturday, she left the hospital in the eastern city of Kharkiv, where she had been held under prison guard, and flew to Kiev.
She told journalists at Kiev airport that those behind violence "must be punished", the Interfax agency reports.
The health ministry says 88 people are now known to have been killed since 18 February.
Ms Tymoshenko was greeted by supporters on her arrival in Kiev
The former Ukrainian Prime Minister is greeted by supporters shortly after being freed
The BBC's Yuri Maloveryan watched ecstatic crowds greet Ms Tymoshenko as she was driven from prison
The parliamentary vote came after police stopped guarding presidential buildings, allowing protesters into the presidential country residence outside Kiev, and parliament made new high-level appointments.
Mr Yanukovych said events in Kiev were a "coup" and vowed not to stand down.
He compared the actions of the opposition to the rise to power of the Nazis in 1930s Germany and claimed MPs from his party had been "beaten, pelted with stones and intimidated".
The opposition is now in effective control of the capital Kiev, with Mr Yanukovych's last known whereabouts in Kharkiv after travelling there late on Friday night.
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Ukrainians on both sides of the East-West divide have long known about corruption at the heart of government.
But as protesters entered Mr Yanukovych's sprawling palatial compound on the outskirts of Kiev, no-one, it seems, expected this amount of gold and marble. As they wandered about the tennis courts, and the underground boxing ring, several were heard to remark: "So this is where all the money went."
There were ostriches, peacocks and grouse. An aviary, perhaps, or a zoo - as there were deer and wild boar too. But then they saw the floating banqueting hall, complete with vodka bottles emblazoned with the president's face. This was no zoo, but a meat-larder on legs - each animal destined for the pot.
This sudden display of exaggerated opulence has revealed the extent to which the president and his entourage have been getting rich at the expense of the country. It could prove a unifying factor.
At the scene
But as protesters entered Mr Yanukovych's sprawling palatial compound on the outskirts of Kiev, no-one, it seems, expected this amount of gold and marble. As they wandered about the tennis courts, and the underground boxing ring, several were heard to remark: "So this is where all the money went."
There were ostriches, peacocks and grouse. An aviary, perhaps, or a zoo - as there were deer and wild boar too. But then they saw the floating banqueting hall, complete with vodka bottles emblazoned with the president's face. This was no zoo, but a meat-larder on legs - each animal destined for the pot.
This sudden display of exaggerated opulence has revealed the extent to which the president and his entourage have been getting rich at the expense of the country. It could prove a unifying factor.
Media reports have quoted
Ukrainian officials as saying Mr Yanukovych was stopped by border police
while attempting to fly to Russia aboard a private plane.
Fiery orator
Ms Tymoshenko's release has been a key demand of the protest movement.The glamorous, fiery orator who helped lead the Orange Revolution - Ukraine's revolt against a controversial election in 2004 - was convicted of criminally exceeding her powers when she agreed a gas deal with Russia which was seen to have disadvantaged Ukraine.
She has always insisted the charges were untrue, inspired by Mr Yanukovych, the man she helped oust in 2004 who returned to defeat her in the 2010 presidential election.
Her release was one of the conditions of the EU-Ukraine trade pact that President Yanukovych rejected last year - triggering the protests that led to the current crisis.
European Commission President Jose Manuel Barroso welcomed Ms Tymoshenko's release, calling it "essential for a democratic Ukraine".
The US also hailed the move. "We continue to urge an end to violence by all sides and a focus on peaceful, democratic dialogue,'' White House spokesman Jay Carney said in a statement.
In a telephone conversation with Russian Foreign Minister Sergei Lavrov, US Secretary of State John Kerry noted the "peaceful atmosphere" prevailing in Kiev after the departure of President Yanukovych, officials said.
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Crowds entered the grounds of President Yanukovych's country house
They did not explicitly support her claim that her detention was politically motivated, nor did they accept her allegations of physical maltreatment and medical neglect in prison.
A pact signed on Friday by Mr Yanukovych and opposition leaders now seems to have been overtaken by events.
It called for the restoration of the 2004 constitution and the formation of a national unity government.
The agreement failed to end the protests huge crowds remaining in Independence Square on Saturday calling for Mr Yanukovych's resignation.
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