Sorry for my english.
From early nintees it was reexport scheme when Gazprom sold gas with 45 USD to Ukraine and Ukraine sold it to Europe with 100 -150 USD. It was sinecure for russian corrupted chiefs (better thiefs) from Gazprom and for Ukranian "independent" chiefs (better thiefs).
It is very interesting why former Gazprom leader and former prime-minister choose end of his career in russian embassy in Ukraine

and why Timoshenko called as Gas-princess with billions of dollar when she was vice-prime minister 8 years ago

?
When orange CIA agent (every orange, red, colourless revolution need a lot of money and Soros foundation and others rich "independent" people gave it to him) became president of Ukraine relationship could be broken but easy money smells better than "democracy" and he also join to this sinecure (his brother owner of 27% of RosUkrEnergo) but spliting to the face of Russia during last years. By the way the main conflict between ukranian president and prime-minister to clear off RosUkrEnergo from gas export and I understand Timoshenko, who was out of gas reexport sinecure last years.
Moreover Ukraine has own gas which can fulfil ukranian needs but nothing to sell to Europe. That is why they need low price for russian gas to sell it to Europe with great profit (by the way russia sell to Europe 110 billion cubic m and to Ukraine 55 billion cubic m. Using this numbers You may think that Ukraine is the biggest country of Europe with the best industry)
Russian big boys (after 'lucky days' of work with Ukranian president) decided that it is time to close this 'fair of generosity' and give to ukraine real price for gas.Ukraine leaders were in hysteria

(bitter rivals Timoshenko and Yustchenko united when understand that noone will have easy gas money) and begin stole european gas.
Thus this gas crisis is not struggle of Ukranian leaders for Ukranian people and "democracy" (to the point REAL democracy was only some years in ancient Athens when ALL people was voting for ANY decision in their town with one interesting amendment - many of them had slaves

). It is a story - will the russian gas reexport from Ukraine start again and if it will start who divide offshore money. I think Yustchenko's son want to change his VERTU to Diamond Cartier telephone and 650 BMW to Bentley Continental GT. But ordinary people from both side will not have any profit only hatred in the end which is good only for US (separate and rule)
I beg ordinary Russians and Ukranians do not blame each other cause we are brothers.
For Europeans ask to check our corruption leaders accounts in your banks (or smell of the easy illegal money is better than "democracy" and "western values"

)
Every event is an iceberg. From mass media we can see only above-water small part but biggest part is under water silence.