Ukraine is a great country. I was in Ivano Frankovsk and in Harkov - amazing places. At this moment I don't think that Ukraine is very safe place, but not so dangerous as Russia. I hope that next winter I will visit Bukovel with my Ukranian friends.
Both Ukraine and Russia are dangerous, they have lived and developed pretty much under the same regime, the communism.
And there is also that conflict with Crimeea and Donbas. For now, indeed, some parts of Ukraine are unsafe. Too bad of what's going on over there.