Over the past week, Brent crude oil prices have decreased by 2.8%, WTI - by 0.9%, according to FactSet. Thus, oil remained in the red for the first time in 3 weeks. On Friday, oil prices showed mixed dynamics. By 18:01 Moscow time, the price of September futures for Brent crude oil fell by 40 cents to 76 dollars 98 cents per barrel. August futures for oil WTI went up by 48 cents to 73 dollars 42 cents per barrel. The pressure on prices is provided by the increase in production by Saudi Arabia. However, serious concerns among market participants raise the approach of US sanctions against Iran.