Oil supermajor ExxonMobil has confirmed that it has signed an exclusivity agreement with Var Energi. This agreement will enable further negotiations on the possible sale of Exxon's Norwegian upstream assets. But the oil giant has informed that the final aggrement is yet to be signed. ExxonMobil is ready to sell its stakes in 20 partner-operated fields. This decision has been taken two years after Exxon sold its operated assets.