We don't know a lot about Europe, but we know that the Fallen burned the UK to the ground. The rest of Europe probably didn't do much better. I assume we mostly stay along the edges. Grimoire says we stumbled across people living in the Rusted Lands who had been terrorized by creatures in the dark. We found Hive seeders and pushed back their presence. The tomb ship that stops by every now and then is probably just for ambience, but lore-wise could be a scout ship. Or a holdover from that zone having a pve presence.