US Secretary of State Mike Pompeo on Wednesday backed calls for a ceasefire in Libya, urging the warring parties to keep out Russian influence and preserve the country’s oil.

Libya’s UN-recognized government has made significant headway in recent weeks in fighting back strongman Khalifa Haftar, whose backer Egypt has called for a ceasefire.

But the Government of National Accord is hoping to take back the strategic city of Sirte, the gateway to Libya’s oil fields.