My understanding from having been in Ukraine several times in 2010 was that the NATO message was not getting out, that it was ineffectual, that it was limited, and that it was not being heard. There was at that time a considerable proportion of the Ukrainian population that was very anxious to join the European Union but quite reluctant by and large to join NATO. This was because of the perception of NATO propagated by the Russian Federation and its supporters abroad that NATO was somehow an offensive alliance, that it was the battled west from the Cold War period. There was a sense among many Ukrainians that they would like to be in the economic zone with Europe because that brought with it all sorts of obvious benefits; the NATO thing, less so.
There was always a small percentage of Ukrainians that wanted to be part of NATO from 1991 on, but that was limited, I would say, probably until 2014, as Professor Kuzio has said. Nowadays, I'm not sure. He said 78% of Ukrainians would be delighted to join NATO. My understanding was that it was closer to 75%, but we won't quibble. I'll go with the higher number.