i think the Ukraine has always had a bit of hamb fist when it comes to Russia after the Orange Revolution.
on one hand they wanted to take a nice commission from Russia piping gas into the EU - with the EU refusing to pay Ukraine's market price (comm on top of Russias "close to market" new price structure) - yet at the same time the Ukraine want gas cheap because they can't afford Russia's new price structure?
i think it's mostly about the fact that Ukraine won't take a reduced comm, and now Russia wants to buy the pipes through Ukraine.
Russia supplies gas to one side of Ukraine at X price, and it comes out the other side of Ukraine at Y price. so bypassing the Ukraine, like the EU want to do directly with Russia, leaves the Ukraine with no bargaining chips against Russia, which could very literally leave them out in the cold, heat and money wise. imagine if Ukraine DID become a NATO force - could be a Georgia issue all over again.
it's meant to be a great deal for everyone involved, instead everyone values the gas differently and therefore the bickering begins.
aren't there scandanavian gas fields that remain untapped?