There also is the matter that like 90 percent of the things they hate about Russia applies to Ukraine as well. However, the ultimate truth about NAFO is that they couldn't care less about Ukraine in any other context besides as an antagonist towards Russia. If this conflict was in Kazakhstan, they'd be simping for Kazakhstan. If this conflict was in Belarus, they'd be simping for Belarus. The main point is that they want to maximize Russian misery and they will gladly fight the Russians to the last [INSERT POST-SOVIET NATIONALITY HERE].
Of course, if [INSERT POST-SOVIET NATIONALITY HERE] decide that they are getting a better deal elsewhere, they will just accuse them of betrayal and being undemocratic cryptorussians.