On Monday, oil prices were slightly increased. Investors assess the impact of drone attacks Ukrainians on Russian refineries

Brent Crude Futures rose by 32 cents, or 0.5 percent, to $67.31 per barrel at 08:00 GMT while American West Texas Intermediate crude was $63.01 barrel, also up 32 cents, or 0.5%.

The two crude oil contracts gained over 1% last week, while Ukraine a intensified its attacks against Russian oil infrastructure, including the largest terminal oil export center, Primorsk.

According to JPMorgan analysts led by Natasha Kaneva in a note, referring to the attack in Primorsk, “The attack suggests a growing desire to disrupt markets international tankers, which has the potential to add pressure to increase in oil prices.”