Regarding opinion polls there are surveys measuring Ukrainian's preferences whether to align with the EU or Russia's Customs Union.
November
IFAK Ukraine poll shows 58% supports EU membership in the future: [qimg]http://i.imgur.com/hshGlrz.jpg[/qimg]
GfK Ukraine poll shows three times the support for the EU Association Agreement compared to Russia's customs union: [qimg]http://i.imgur.com/LdjvEvM.jpg[/qimg]
And
September poll by The Kyiv International Institute of Sociology showed 41% favoring the EU and 35% Russia's Customs Union. Western/Central parts preferred the EU while Russia was mostly supported in Southern/Eastern regions. Interestingly in the demographic breakdown the support for the EU is by far biggest among the young while it's the old that seem to favour Russia's Customs Union which has its strongest support among the >70 year olds:
[qimg]http://i.imgur.com/tuRO7c9.jpg[/qimg]
The results do vary between surveys and in November poll by KIIS the support between those two options was even yet still with the strong East/West and Old/Young divisions.