(ABC) Irans powerful Revolutionary Guard is ready for combat and any scenario its chief commander said Saturday as the countrys nuclear deal with world powers collapses and the U.S. alleged Iran was behind a weekend attack on major oil sites in Saudi Arabia that shook global energy markets. Iran has denied involvement in the Sept. 14 attack that was initially claimed by Yemens Iranian-backed Houthi rebels. Iranian Foreign Minister Mohammad Javad Zarif who is in New York for the U.N. meetings has warned that any retaliatory strike on Iran by the U.S. or Saudi Arabia will result in an all-out war. On Saturday Gen. Hossein Salami at a ceremony displaying pieces of an American drone Iran shot down in June said that his forces have carried out war exercises and are ready for any scenario.