Iran has every right to it's sovereign defense.
However, no nation should have the right to sovereign
offense without internationally backed cause.
Be nice if Iran the biggest non western player in the Region and the U.S. would both get off their collective as#es and deal with this ISIS thing as partners for once. Iranian regional know how with American backing I feel could contain and weaken ISIS's grip on it's current territories.
Lest anything constructive happen for once.