Membership is for broadcasting organizations whose countries are within the European Broadcasting Area, as defined by the International Telecommunication Union, or are members of the Council of Europe.

https://www.ebu.ch/about/members

The double standards though, are stated further down the same page:

The EBU’s Belarusian Member was suspended from the Union in May 2021. The EBU’s Russian Members were suspended from the Union in May 2022.