I'm not sure if SE is aware of the problem, even if they aren't, that wouldn't surprise me. The way I see it, these connection problems are just affecting those people who have to use Cogent nodes in Amsterdam on the way to the SE Servers Japan - and that really isn't SE's fault. I've tried VPN from UK and Switzerland and both are fine, so it's not the entirety of europe that is affected, just certain providers with certain peerings. And no, international connections do not really care if countries are part of the European Union or not. All in all there is really no reason to assume that SE stopped caring about Europe. Just so you know, FFXIV is affected as well.