I think you are mistaking "oil" (crude oil) as a straight stand-in for jet fuel. The former is a raw material (one that has a lot of "flavors"), whereas the latter is one possible product from refinement of that raw material. It should be noted that not all refineries are setup to produce jet fuel, and not all crude oil is viable for making jet fuel. I don't know the details about Europe's mix on refineries an d viable crude oil supplies.

As it happens, about 75% of Europe's jet fuel comes from the Middle East (I don't immediately have numbers for what of that goes through the Persion Gulf). That percentage puts it outside of the range you can correct with market changes (other than most flights don't fly... that is pretty drastic).