I think assange admitted as much along the lines they have a target for the largest agent of badness, as they saw it. So, given they interpret the US to be the greater agent of spying/espionage and implied they'd like to level the playing field, it's little surprise we don't see much in regards to Russia and China, along with Iran or Sudan.

Personally I don't agree with their tack, but that is what I gather is their tack from their, assange's, statements.