score:9
I was in the Ukraine in May traveling on a Western European passport.
Upon entry, not a single question was asked. Not even purpose of visit or which regions I would visit. I simply got stamped in and that was that.
Based on this experience, I assume that it is not generally enforced and rarely checked. Probably they start asking this kind of things only when some red flags are raised. I was not even aware of the requirement and did not have the documentation on me to prove my financial situation.