зафиксировать договоренности в контрактных обязательствах

[upahill]

И после известных печальных и тяжелых событий конца прошлого — начала этого года (Россия и Украина не могли договориться относительно цены на газ, и поставки этого топлива в Европу были приостановлены. — БелаПАН.) нам все-таки удалось выйти на договоренности с Украиной и зафиксировать эти договоренности в контрактных обязательствах с обеих сторон — что мы переходим именно на рыночные отношения по цене и по транзиту."

And after notorious events which had occurred at the end of the past and beginning of this year (Russia and Ukraine failed to come to terms in regard (relating to) price on gas and supplies of this fuel material (propellant) to Europe were frozen) we, nevertheless, managed to come to an agreement with Ukraine and to FIX THESE AGREEMENTS ON CONTRACTUAL LIABILITIES ON EITHER SIDE – that we switch to a market economy in terms of price and transit.

[Акуна Матата!]

Since it is a quote, don't think too hard. Keep closer to the text.

"After the distressful and tough/difficult things that happened last year and at the beginning of this year[Russian-Ukrainian dispute over gas supplies] , we, however, have managed to reach agreements with Ukraine and finalize them through a contract under which we have pledged to adopt/use a market approach to pricing and transit shipments," said Mr. Pupkin.

[keyboard.im]

market-based pricing formula

[upahill]

спасибо огромное!