11 October 2011
Last updated at 13:55
In November 2004, Viktor Yanukovych was declared winner of Ukraine's presidential election, but international observers reported widespread fraud. The defeated candidate Viktor Yushchenko (centre) and his top ally Yulia Tymoshenko (left) called mass protests in the streets, which became the Orange Revolution.
Mrs Tymoshenko delivered a speech during an emergency session of parliament in December 2004, as MPs tried to break a deadlock between the ruling regime and the opposition.
In a re-run of the vote, Mr Yushchenko emerged triumphant, and soon afterwards Mrs Tymoshenko was appointed prime minister.
A year after the revolution, Mrs Tymoshenko still had widespread popular support - but her relationship with her Orange allies, and particularly President Yushchenko, had already turned sour, and she lost her post as prime minister.
She regained the premiership in 2007 - but her relationship with Mr Yushchenko remained poisonous. The two sides' squabbling paralysed the government even as it faced a severe economic crisis.
In 2010, with President Yushchenko's dismal popularity preventing his re-election, Mrs Tymoshenko ran for the top job. She lost, in a run-off, to Viktor Yanukovych, whose fraudulent victory she helped overturn six years earlier. The Orange Revolution had therefore proved short-lived. Mrs Tymoshenko again claimed the election was rigged - but this time observers gave it a thumbs up.
Soon, she found herself on trial, accused of abusing her power by signing a deal with Russia to end the two countries' gas wars, that was deemed disadvantageous to Ukraine.
Mrs Tymoshenko accused President Yanukovych of staging a political trial, and the call was taken up by hundreds of supporters who regularly gathered outside court.
On 11 October, 2011, Judge Rodion Kireyev pronounced her guilty, sentencing her to seven years in jail. Speaking over the judge, even as he read the verdict, Mrs Tymoshenko denounced it and vowed to fight "till her last breath".