That's a good question! Maybe they are far enough from microsoft redmond headquarters that they really don't really care.
Massive populations, with highest number of people/partners/oems/employees who have access to the ISO? Just a guess
No idea about Russia, but try buying any OEM computer these days not built in a Chinese-speaking location, that would explain why they always have it first.
Think of the money being made from "having it first" I think there maybe more corrupt companies in China and Russia also. Think about all the news generated from those screenshots and all the links to websites like win8china. Have you seen how many Adds are on that site? They must be raking in a fair bit from people just checking out their website. When the users start to diminish i am think more news will be posted or a link. If it was me with RTM i would setup a site with like stupid amounts of pay per view and pay per click adds and just have the one rtm photo on it. Every now and then release another photo to keep people comming
What I don't understand is, in the past doesn't a iso link usually come with the screen shots, or is it screenshots for a couple of days then the iso?
Chinese is the mostly spoken Language by Native speaker around the world and NOT English! That's something we shouldn't forget!