The United States has openly accused Iran of being behind the drone and cruise missile attacks on Saudi Arabia’s largest oil refinery.

The attacks did not directly affect the U.S., save for the spike in oil prices, which actually helps the American oil industry. There is a temptation to let the attacks slip into history. But the United States has formed an anti-Iran alliance in which Saudi Arabia is a key (though weak) player …. Failing to respond to an Iranian attack on a vital Saudi facility could help Iran increase its power throughout the region …. Military action against Iran … would both endanger the alliance structure and cut against U.S. strategy.

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