Oil prices are up around 6% Sunday evening after the weekend brought fresh escalation of the U.S.-Iran conflict. Why it matters: The jump after international markets opened reverses a large chunk of the sharp decline Friday, when President Trump and Iran's foreign minister claimed the Strait of Hormuz was opening to tanker traffic. The longer oil transit remains throttled, the longer crude prices will remain high. That affects U.S. drivers, because the county is deeply tethered to the global oil market despite being the world's largest producer. The latest: The global benchmark Brent crude surged to $95.42 Sunday night, while WTI, the main U.S. reference, reached $89.77. Both remained hovering around those prices late Sunday. Catch up quick: American forces seized an Iranian-flagged cargo ship after it tried to bypass a U.S. naval blockade in the Gulf of Oman, President Trump said Sunday. It's the first seizure and the first ship fired upon since the U.S.…