Ukraine faces the risk of chaos after Sunday's presidential vote after Yulia Tymoshenko, the Prime Minister, threatened yesterday to create another massive Orange Revolution-style demonstration to prevent her loss to front-runner Viktor Yanukovych.
She was responding to election-law changes, orchestrated on Wednesday by Mr. Yanukovych's parliamentary supporters, which could increase the likelihood of fraud similar to that in 2004, which precipitated the huge demonstrations.
"I ask you not to allow Yanukovych to rape our democracy, our election and our country!" said Ms. Tymoshenko, who finished 10 percentage points behind her bitter rival in the first round of voting last month.
"If we do not manage ... to ensure that the expression of the people's will and the results of this will are held in an honest way we will call people out.
"If Yanukovych wants an honest fight, we are ready to compete with him, but if he seeks to cheat, we will be able to rebuff him in a way he has never seen, even in 2004."
Mr. Yanukovych, whose 2004 presidential victory was overturned after evidence of widespread vote-rigging, ridiculed her gambit.
"This is a sign of weakness and a sign that she has understood she is losing," he said in predominantly Russian-speaking eastern Ukraine, one of his power bases.
"The only people who will go to Independence Square [the site of the Orange Revolution protests] are those who like the same dishes as Tymoshenko --dirt, lies and slander."
The possibility of a post-election street fight -- and court battle -- increases uncertainty in a country of 46 million that is seeking the resumption of a suspended US$16.4-billion International Monetary Fund loan.
The legislative changes affect the rules governing polling stations and could increase the risk of partisan influence of the vote process, analysts say.
The new rules were quickly signed into law by President Viktor Yushchenko, Mr. Tymoshenko's 2004 Orange Revolution partner, who became her arch-rival.
"The changes do not make fraud inevitable, but they weaken the insurance mechanisms that are designed to stop it," Andrew Wilson, an analyst with the European Council on Foreign Relations, wrote in his blog.
"Yanukovych's supporters, meanwhile, have reminded the world that they have never come to terms with, or even admitted, what they did in 2004."
But Mr. Wilson and David Marples, a historian at the University of Alberta believe the legal changes are also being exploited by Ms. Tymoshenko, a firebrand populist.
The Ukrainian Prime Minister is sounding increasingly "desperate" and appears to be implying she won't accept defeat, said Mr. Marples, director of the Canadian Institute of Ukrainian Studies, in an email.
"But the fact remains that few, if any discrepancies of voting procedure were observed in the first round. I am not suggesting that a Yanukovych presidency would be good for Ukraine, or that he is [a] pleasant or particularly honest man.
"Yet, if he won the first round by more than 10 [percentage points] without cheating, then why would he cheat on the second, especially with the entire world watching?"