The legitimacy of the Ukrainian parliament is today at 1.5-2%. They do not have the legitimacy that gives them the right to speak on behalf of the people on issues like on accession to NATO and the EU.
The West does not need Ukraine, and in case it does – it is for one reason only: to antagonise Russia. The West is going to push the next President of Ukraine to conflict with Russia, just as it did with Saakashvili in 2008. But Ukraine is now being pushed into a more serious pit.