Prime Minister Yulia Tymoshenko broke more than three days of silence after her defeat in presidential elections, slamming her rival but still defying mounting pressure to concede.

NONE Speaking before a cabinet meeting with her golden hair braid tied as usual on her head, Tymoshenko made no mention of the election result and instead accused winning candidate Viktor Yanukovych of deceiving Ukraine with promises.

Yanukovych beat Tymoshenko by almost 3.5 percent in Sunday's vote but the prime minister's party has alleged that substantial fraud casts doubt on the outcome, raising fears of a prolonged political crisis in the country.

However international observers and Western states hailed the vote as fair and clean.

With political tensions showing no sign of slackening, thousands of Yanukovych supporters maintained a picket outside the central election commission Thursday with the aim of ensuring the results were not changed.

"Today it is clear that no one from the Yanukovych team is intending to raise social standards. This was just PR," Tymoshenko told her cabinet, commenting on a parliamentary bill Yanukovych's party had failed to support.

"Already after the elections, the deceptions of the campaign are starting up again," she added.

The last public comments by Tymoshenko had been on Sunday night after the publication of exit polls. She subsequently disappeared from public view.

'No intention of resigning'

Tymoshenko made no comment on the elections themselves. But the very fact of holding a cabinet meeting will be seen as an act of defiance after Yanukovych told her to acknowledge the will of the people and resign as prime minister.

However the deputy head of Yanukovych's Regions Party, Borys Kolesnykov, shrugged off her defiance as meaningless.

"There is no article in the Ukrainian constitution that specifies that the results of an election have to be acknowledged by Yulia Tymoshenko," he said.

But the prime minister's right-hand man Olexander Turchynov said the government had no intention of resigning.

"The government will resign of its own accord only if parliament is changed (after elections). As far as I know there has been no news about this."

NONE Respected Internet newspaper Ukrainska Pravda earlier this week reported that Tymoshenko had told her party she would never recognise the legitimacy of Yanukovych.

The rally by Yanukovych supporters outside the central election commission has been maintained since the results came out, attended mainly by supporters from his eastern Ukrainian strongholds.

Quoting the interior ministry, Interfax said 2,500 supporters were bussed into Kiev from the regions Thursday to provide reinforcements for the rally.

Tymoshenko was one of the leaders of the 2004 Orange Revolution that sparked hopes of a new start in the ex-Soviet country bordering the EU and Russia but whose ambitions crumbled amid political infighting and an economic crisis.

The 'people's verdict'

Yanukovych has long been seen as a pro-Kremlin figure and was accused of staging the vote-rigging in the 2004 presidential elections that sparked the Orange uprising.

Unusually, international observers including the OSCE implicitly told Tymoshenko to concede by saying Ukraine's leaders had to listen to the "people's verdict".

NONE French President Nicolas Sarkozy meanwhile became one of the first Western leaders to congratulate Yanukovych, as did strongly pro-Western Georgian President Mikheil Saakashvili.

They were followed by US President Barack Obama and leaders of the European Union.

The White House said in a statement Thursday: "President Obama called Viktor Yanukovych of Ukraine today to congratulate him on his election and wish him success in carrying out his mandate.

"This peaceful expression of the political will of Ukrainian voters is another positive step in strengthening democracy in Ukraine."