South Africa’s national oil company PetroSA and Russia’s State geological company Rosgeologia (Rosgeo) are in talks to finalise a $359-million farmout deal to give Russia its first foothold in a prospective oil- and gasfield offshore South Africa, three sources have said. PetroSA is under pressure to boost dwindling domestic resources that have imperiled its flagship Mossel Bay gas-to-liquid refinery, which is operating well below capacity. The company is hoping the tie-up with Rosgeo and other partners, including Norway’s Equinor, will accelerate exploration in acreage it holds.