Situations like that are always complex.
And to understand it, one will need to learn about the country's history and culture (and not just recent, but for the last few hundred years at least), cross-reference information from different sides and different sources, keeping in mind that there's no such thing as unbiased source. Also, learning not only about Ukrainian history and culture, but about its neighbors' won't go amiss.
But that's difficult, time-consuming, and more you'll learn, less likely you'll come to some simple and clear conclusion and more likely understand that there's no absolute truth.
Also, by the time you'll be able to comprehend the situation, everyone will move on to some other country in search for oil or watercolors or something like that. And that's no good.

Luckily, humankind invented some nifty surrogates for critical thinking: snap judgment, stereotyping, bigotry, propaganda, black and white thinking, etc.
They are easy, comfy, understandable by anyone, cost-effective and time-saving.
All you need to do is to listen to someone you trust (surely they've done that "learning and thinking stuff" themselves), someone from the country (why would they be biased?), or someone ever been to the country (tourists know it all), or even someone you fancy (some of the newsreaders are so sexy).
Listen to what they're saying and assume it as your own opinion, and that's it.


And the ironic thing is, is that most people are well aware of these "quick solutions" and 100% sure they're not gonna fall into them, or at least will be able to tell and stop themselves in time.