"Regarding the main route for exiting energy, Iran will definitely act to impose control on the Persian Gulf and Strait of Hormuz," Jafari said of the Gulf waterway through which about two-fifths of all globally traded oil passes.
The Revolutionary Guards are the ideologically driven wing of Iran's military with air, sea and land capabilities, and a separate command structure to regular units.
Jafari warned neighbors not to let their territory be used.
"If the attack takes place from the soil of another country ... the country attacked has the right to respond to the enemy's military action from where the operation started," he said.
Supreme Leader Ayatollah Ali Khamenei, has in the past said Iran would target U.S. interests if attacked.
"Israelis know if they take military action against Iran ... the abilities of the Islamic and Shi'ite world, especially in the region, will deliver fatal blows," Jafari said, adding that Israel was in range of Iranian missiles.
