I can easily imagine both a) countries restoring relationship with Russia with Putin and b) Putin by various reasons being replaced by another server of national capital, with some shifts in money, giving excuse to EU to reestablish relationship.
EU was buying gas and oil from Russia for the last 40+ years, they were okay with pumping Russia with billions of euros even after Crimea annexation (and they still pump some moneys during 2022), also funding Russian military industrial complex, that is now blowing up Ukraine. So I’m pretty sure that when dusts settles, Russia will come back as part of international community, maybe with a slightly different leadership.
It’s not unheard for “the West” to maintain good relationships and trade with countries engaged in armed conflicts or human rights violations, if there’re good economical and political reasons. So I won’t be surprised if after conflict has settled, “the West” will slowly restore relationship with Russia, maybe with a slightly different leadership (eg without Putin - but it doesn’t make much difference overall)
EU was buying gas and oil from Russia for the last 40+ years, they were okay with pumping Russia with billions of euros even after Crimea annexation (and they still pump some moneys during 2022), also funding Russian military industrial complex, that is now blowing up Ukraine. So I’m pretty sure that when dusts settles, Russia will come back as part of international community, maybe with a slightly different leadership.