A top presidential aide says Ukraine may later seek changes to a hard-won gas deal with Russia because it hurts the national economy, according to AP via Yahoo! News .

President Viktor Yushchenko`s economic adviser Olexandr Shlapak told reporters Friday that while the deal will be implemented for now, Ukraine may seek to revise it this summer.

Shlapak says Ukrainian officials should examine the agreement together with European specialists and come up with proposals to amend the deal.

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The agreement was signed by the countries` state gas companies and ended a nearly two-week gas cutoff to European countries caused by a politically charged gas dispute between the two ex-Soviet neighbors.