How has Europe actively hindered the war effort? Not volunteering for demining duties under fire in a very narrow straight, and preferring diplomatic solutions seems eminently sensible, and not at all the same as 'getting closer to Iran'. Why doesn't the US send frigates and destroyers into the straight to open it and escort ships out? The answer is that it's pretty high risk, and not one worth taking (unless you are Trump and looking to save face).