European stocks are set to open the week's final trading session in negative territory as oil prices continue to rise, raising concerns about disruptions to energy supplies. The FTSE 100 is expected to open down 0.05%, France's CAC 40 is also expected to lower, and the German DAX will also fall. The U.S. has issued a temporary 30-day waiver on sanctioned Russian oil in transit at sea to address concerns about a growing supply squeeze. Despite a record 400 million barrel release from its emergency reserves, Brent crude prices remains above $100 a barrel. Meanwhile, West Texas Intermediate was last seen at $95.96.