Well, with EU being socialistic, crazy leviathan with response time measured in years, I wouldn't count on them. And after USA's thing in Syria... Well, I wouldn't count on them either. As for the neighbours of Ukraine, I think Belarus doesn't even need a comment here, Russia can come in, but only to screw you over and over again, Moldova also doesn't seem to be anything like helping (anybody in anything, for that matter)... And Poland, as much as I hate it, with those (preventive self-censoring in progress) in power, will try to give you as much support as possible, but I don't think you should count on anything official. As for the Romania, I really don't know, but if Nicolae Ceaușescu is any indication, they should be willing to help you as well.
All I can say is: burn the (self-censoring in progress again) who are in power now. Or hang them, it works either way. And it's the only way. And then start building a real middle-European alliance of free nations. That's the only way we can get anything good from this geopolitical position (by 'we' I mean 'civilized Slavic nations', which excludes Russia), and every time somebody has a different idea, there come some Soviet communist army or a German, Nazi one and bends everyone over and (yeah, you guess, self-censoring in progress) us over and over and over again.
Stay strong.
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Ninja edit: I don't recall anybody in the world actually getting any real help from the West, however it is defined. At least anybody not being from the West themselves. Why we do still believe them?