Gee, this is pretty impressive. Go and try to find an Estonian Embassy website that is not under a denial of service attack.
Now the blame might be directed at Russian hackers, but I suspect that it is the Russian Government behind this. After all, there is nothing in it for hackers to waste resources to do this, unless someone is paying them to do it.
And yes, there are no problems with my Internet service. (Posting this is proof of that.....)