Shell was part of an ExxonMobil-led consortium that beat out Russian player Lukoil to land a 2012 production-sharing agreement with the Ukraine government on the Skifska field.
But signing of a final deal stalled and was postponed in January for the second time.
"We expected to sign the PSA in 2012 or 2013. Regrettably, this has not been achieved," a Shell spokeswoman told Upstream.
"Therefore,
