Israel launched a major attack on an Iranian gas field this week, prompting retaliation by Iran against Gulf States, a threat to global energy supplies and a surge in fuel prices. President Trump first insisted the United States “knew nothing about” the strike, then later backtracked and said he warned Israel against attacking the complex. His attempt to distance his administration from the strike underscored the diverging aims of the United States and Israel as their war against Iran grinds on. As a superpower with global responsibilities, the United States cares deeply about global energy supplies and the safety of...