The deals were reportedly offered as incentives to push the Kremlin toward a peace agreement and to provide Washington with justification for easing certain sanctions on Russia.

U.S. and Russian government officials discussed several energy deals on the sidelines of negotiations this month that sought to achieve peace in Ukraine, according to five sources familiar with the talks.

Senior U.S. and Russian officials discussed potential energy deals, including ExxonMobil's return to Sakhalin-1 and Russian purchases of U.S. LNG equipment, on the sidelines of the Ukraine peace talks in early August,