Former prime minister Yulia Tymoshenko has stressed Ukraine "must be a member of Nato" in order to protect itself from Russian aggression.
Tymoshenko, who is running in the May 25 presidential election, told the Associated Press that while only a minority of Ukrainians supported Nato membership previously, Russia's actions in the country's east had forced a "fundamental change" in public thinking.
She said Russian President Vladimir Putin "was able to change the mentality of Ukrainians and turn us in a different strategic direction" due to "his war against us".
"Nato is the best choice for Ukraine," Tymoshenko added.
European Union foreign ministers added 13 people to their visa ban and asset freeze list over Ukraine's crisis.
Well that’s the voting over, and no surprises so far. A ‘Yes’ vote claimed to be 89% in Donetsk, and suddenly Ukraine is no more.
Nearly 90 percent of voters in eastern Ukrainian region voted for self-rule, the head of the separatist election commission said.