Russia started this clusterfuck to try and stop EU membership for Ukraine. Makes sense that the best way to thwart them would be to do the original thing they were trying to prevent.

At first blush it sounds like hyperbole, but after reading the article and musing on it I agree for two reasons:

1. Ukraine is the only EU candidate with actual experience in a ground war for survival, and would bring seasoned veterans and tested methodology to international war efforts
2. Fast-tracking an EU candidate that is being actively invaded tells Russia (and future belligerents) that the EU is keeping military interdiction on the table even for current non-members