I warmly suggest you to read this great article published on SickPix by Vaida Balbieriute. It is a sintetic but nonetheless rather complete review of the current and past state of relations between Russia and Ukraine and it includes some opinions on the path the European Union should take in order to solve the current crisis:
If EU decides to fully commit to the relationship with Ukraine, it has to rethink how to resuscitate its democracy and ignite the rule of law without looking as an outsider, posing commands. And while it is up to Ukraine to find the solution to the unique Ukrainian problem, EU needs to provide more than just an open wallet to convince half of Ukraine’s population that Europe, and not Russia, is where they want to be.
Read the full article here.