$1 Billion
Russia's next President is Medvedev, Gazprom's chairman. Gazprom owns 50% of RosUkrEnergo.
RosUkrEnergo and Mogilevich (remember the "gas war"?). RosUkrEnergo
apparently owes Gazprom more than $1 billion. Moscow is angry at Smirnov because of some missing $1 Billion. Coincidence? Is this the same $1 Billion
or is it another $1 Billion? Smirnov is out in the cold. Mogilevich is apparently out in the cold as well, as he got
arrested last week. 1$ Billion here, $1 Billion there. Two powerful men
who used to be backed by Moscow, have now obviously lost support from Moscow.
Kyiv Post: Why Russia arrested Mogilevich
Jan 31 2008
Any suspicions of links to organized crime could sink Gazprom’s NYSE bid, which would be seen as not only a financial blow to the gas monopoly, but
a major setback for Russia and Gazprom’s chairman, Dmitry Medvedev, who was slated to be elected president of Russia in March.
Housecleaning in RUE began with the removal of Palchykov as co-director of RUE. Then it was discovered that RUE owed Gazprom more than $1
billion
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Russia’s Got a Substitute for Transdniestria Leader

Moscow still wants to know what happened to $1 billion that Transdniestrian authorities collected from people for Russian gas but did not pay it
to Russia.
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But of course, it's all just a coincidence...