Oil prices surged on Friday and were on track for a third straight week of gains as traders focused on potential supply disruptions from more sanctions on Russia and Iran. Brent crude futures gained $2.

The United States will impose some of the harshest sanctions yet on Russia's oil industry, according to a purported U.S. Treasury document circulating among traders in Europe and Asia that drove global oil prices 3% higher on Friday.

Indian firms see a major disruption of Russian oil supplies as Washington imposes new sanctions to curb Moscow's revenues, pushing refiners to scout for crude from the Middle East and the U.S., three Indian refining sources said on Friday.