Keep the USA out of it.
The fact that we defend (and Americans die for!) the family-gangster-kleptocracy that owns and propagates disgusting Wahabbist Islam has got to be the biggest stain on American foreign policy for the last 40 years.
This is our one chance to make sure Iran cannot get nuclear weapons. It could be the plan.
We should stay out of it, but we should use it as an opportunity to scheme for regime change. If Iranian armies get bogged down in deserts, and huge numbers of their soldiers are dying, they may just head back home ready to get rid of the mullahs.