Is Iran desiring to restore the boundaries of ancient Persia?

Prophetically, we know that the Northern alliance of Ezekiel 38-39 includes Russia, Syria, Turkey and Iran. Do you believe that the Iranian desire to claim the area of Iraq being opened up now as Islamic State is being forced out and to form a complete land bridge from Iran to the Mediterranean Sea to be a restoring of the old boundaries of ancient Persia and if so, can the U.S. do anything to stop this?