From a Ukrainian point of view, the priority is not to throw their revolution away again like they did after the Orange Revolution 10 years ago. But from everybody else's point of view, the priority now is to avoid an irreparable breach between Russia and the West. One Cold War was enough.
The Yanukovych era is finished; the former president will not make another comeback. He has killed too many people, and the vulgar ostentation of his former palace (whose architect understandably chose to remain anonymous) has shocked Ukrainians even though they already knew he was deeply corrupt. Besides, Russia will not bet on this horse again.
On the other hand, the various opposition leaders will have great difficulty in deciding who leads their coalition, if indeed they can even agree on a coalition before the promised election on May 25. But they'll still win the election, because Yanukovych never allowed any plausible rivals to emerge in his pro-Russian Party of the Regions, and Russia will not be able to find and groom a suitable replacement in time.
Who will emerge as Ukraine's next leader? Yulia Tymoshenko, newly released from prison, is the obvious choice, and that would certainly ease matters on the Russian front.
She got along reasonably well with Vladimir Putin, the Russian president, when she was prime minister last time. But many Ukrainians who backed the revolution don't trust her.