I doubt a link can be found to any contract. At this point with each side throwing claim and counter-claim, it would probably be impossible to sift thorough all the BS on the web to find a contract.
We'll have to see what "In News there is no truth; in Truth there is no news" has to say in the upcoming days.
If, per quote in #11, the Naftogas/Gasprom contract is subject to arbitration in Swedish court, then it must be on file there - and might be searchable from there.