Targum on Berit Bein Habetarim Notes Iran's Downfall
Both the Kol Emunim newsletter (p.1, left column) and Hashem1.net (from 5 years ago) note how Iran's downfall is noted by what's known as the Targum Yonatan on Parshat Lech Lecha. (I linked to it 5 years ago too.)
If you see the Targum inside, it appears that the Targum Yerushalmi agrees to the Targum Yonatan that Iran's downfall is noted.
Hashem1.net notes from the wording of the Targumim that not only will its downfall occur, but its downfall will be such that it will never rise again. Also, from the wording of the Targum Yonatan at least, it will cause the rise of the nation of the house of Israel. May this occur speedily in our days.
Update: Some commenters (Anonymous and Josh) have pointed out that the original manuscript of Targum Yonatan had "Edom" instead of "Persia" and that some versions have "Persia" due to the censors. I commented that it could be that the censors prophecied not knowing what they prophecied. One possibly could use the same reasoning in this post which comes from Vayikra Rabba.