Iceland hasn't exactly been very vocal about supporting him, so Ecuador might be the best choice. Russia I think was pretty vocal, but maybe they just wanted to make fun of US, and aren't really serious about protecting Snowden. Plus, they support US's surveillance state, so there's little reason why they'd want to protect him, other than being vengeful against US for whatever reason.
Ecuador so far has been pretty good for Assange, and they might continue to want to be seen as "the country that stood up to US", but nobody really knows how far they are willing to go to do that. At least Assange hasn't even been charged with anything by US, yet.