Ukraine is in a really tough spot of needing all the aid they can get, they can’t really afford to upset any of their backers even if they want to. Especially with some difficulties already starting to arise on that front with recent elections in Europe, coming elections in the US, general media weariness on the topic etc.
I have no idea of the man’s personal beliefs on this issue but it’s too simple to just look at these votes without taking into account the reality of their situation.