Isn't one of the core characteristics of a NSL that you can't tell us?
It's also not the only attack model; it serves only as an example of the sort of power Five Eyes has within the five nations they wouldn't necessarily have in Iceland.
I would be curious the issues with colocation in Russia. Judging by all of the potential issues with US/EU providers, it seems they may offer a certain class of comparative "safe haven" for particular types of applications.
I.e. if it became illegal to say certain things about the US government, could I (an American citizen) hypothetically host my protest blog on a Russian provider and avoid prosecution?
Yes, you could probably safely criticize the US on a Russian-hosted blog, but in the scenario of a repeal of the First Amendment, I can't imagine the hosting location would save you from any theoretical prosecution.
It's also not the only attack model; it serves only as an example of the sort of power Five Eyes has within the five nations they wouldn't necessarily have in Iceland.
Another example: https://en.wikipedia.org/wiki/Room_641A
Colocating in Russia comes with its own issues.