Bulgaria negotiates with ExxonMobil over area disputed with Romania for possible hydrocarbon deposits - diplomatic sources
Additionally, the area is on the route of the future South Stream pipeline.
The sources claim Romania would bring the litigation to the Hague court unless a deal is reached in the next round of negotiations.
South Stream is an Russian initiative competing with the Nabucco pipeline project supported by the EU and the US. South Stream would bring Russian gas to Central and Eastern Europe through Bulgaria, while Nabucco would deliver gas from Azerbaijan through Romania.