Ukraine has never been fully committed to joining Nato.
https://en.wikipedia.org/wiki/Ukraine–NATO_relations
Excerpt;
According to polls conducted between 2005 and 2013, Ukrainian public support of NATO membership remained low.[11][12][13][14][15][16][17] However, since Russian military intervention in Ukraine and Crimea, public support for Ukrainian membership in NATO has risen greatly.
Since June 2014, polls showed that about 50% of those asked supported Ukrainian NATO membership.[18][19][20][21]
Some 69% of Ukrainians want to join NATO, according to a June 2017 poll by the Democratic Initiatives Foundation, compared to 28% support in 2012 when Yanukovich was in power.[22]
I always love it when a poll leads with "Of Those Asked"
If you went to a BLM meeting and asked questions.
You'd get decidedly different answers than at a Trump rally.
For further reading, take a gander at "The Orange Revolution"
Not unlike Trump's hair. There are other similarities as well.
https://en.wikipedia.org/wiki/Orange_Revolution