The sea of Oktuhsk(sp) is a very hydrocarbon rich area and the PSA's were very favorable to the operators but not the Russian government.
I question whether Gazprom has the technology, personnel, and ability to do it alone, as they want to, but the fact of the matter is that the resources lie in their jurisdiction and no matter how much Exxon, Statoil, or anyone else may not like it, that is the way it is.
Why didn't Putin/Gazprom kick out Shell 100%? It's obvious that they still need Shell's expertise. Shell will probably continue to do the serious work while the vodka swillers will get more of the profits. It reminds me of an Indian casino when they hire outside management that has gambling expertise. The lazy uneducated tribal members get their yearly payouts while sitting on their butts