why is (if it is US only)
So Amazon lowers the price of the book for the end customer. On Amazon.com the version with is costs $79. Ads Amazon hopes that sooner or later you something advertised he will buy.
why the device is not Russified
Officially it in the Russian market is not supplied.
This is some neoficialni?
It is completely official. You just bought it through an intermediary. Theoretically, problems may arise in the occurrence of guarantee cases, but on habré there were a couple of articles refuting this myth.
About the icon Rostest were rumors
that Amazon was negotiating with a Russian company about the official supply of Kindle in Russia, but they are so useless and didn't come.