Russia never joined the European Union.
Russia has zero seats in European Parliament.
Russia can’t speak there.
If you believe in free speech,
let Russia speak.
Russia can speak, but they have to do it as an equal and not dictate conditions, which is their habit.
If they want to be one among many, they can submit to join the EU. They have shown they are not interested in that.
If they want to stop being so agressive, they could join NATO. They have shown they are not inerested in not being agressive.
There is no go reason to allow Russia into the EU so they can have a 'voice'. They have made their position quite clear, they want to contol all of the former soviet states. Those states have made it clear they don't want to join Russia.
To allow them into the EU or NATO is not going to bring peace. It will just be letting the wolf in with the sheep. There is no happy wishisy way out of this, and I understand why you hope so. But Russia has to be reasonable, and right now they are acting like the child that is not getting their way.
You are acting like Russia just wants a seat at the table, but what they clearly want is the whole table. To pretend otherwise is fooling yourself. It is time for Winston Churchill, not Neville Chamberlain.