I agree that inviting representatives of right-wing groups to a meeting with Zelensky on veterans affairs is a political mistake.
That does not negate the fact that these right-wing organizations, including "Right Sector" had negligible popular support and won exactly 0 seats in Verhovna Rada.
Again a very poor reason to invade a neighboring country
Read Bellingcat's coverage of the problem from 2019: https://www.bellingcat.com/news/uk-and-europe/2019/11/11/ukr...
Azov members have close access to major Ukrainian politicians, including Arsen Avakov, the (now-former) Interior Minister.
https://www.opendemocracy.net/en/odr/rise-of-azov/