"This time it's different" is a well-worn cliché that seems to be getting another whirl with the latest U.S. sanctions against Russia's crude oil exports. Oil prices jumped in the wake of the new measures aimed at preventing Russia from shipping crude using a so-called "dark fleet" of tankers. It does seem strange an industry which has been arguing since Russia's 2022 invasion of Ukraine that sanctions are largely ineffective, should suddenly switch to thinking the new steps are the real deal.