Oil prices strengthened on Monday as an attack on an oil pipeline pumping station in the Caspian Sea slowed flows from Kazakhstan, while investors monitored developments of a possible Moscow-Kiev ceasefire agreement that could ease sanctions and increase global supplies.

Oil futures were lifted Tuesday, ending with gains after a drone attack by Ukraine on a pipeline carrying crude from Kazakhstan across southern Russia curtailed flows.

Oil prices were rising in early trade after a drone strike hit a pipeline pumping station in Russia, disrupting flows to global markets. WTI jumped 1.3% to $71.62 a barrel, while Brent crude was up 0.

Oil extended gains on Tuesday after a drone attack on an oil pipeline pumping station in Russia reduced flows from Kazakhstan, though prices were kept in check by the prospect of rising supply. Brent crude futures gained 44 cents,

Ukrainian military forces have attacked one of the Lukoil refineries in Russia. According to Bloomberg, it processes 300,000