When We are Ruled Only by Xianity, the Geula Will Come
2 years ago, I posted this. See the Gemara I quoted along with the Maharsha's explanation.
The Yalkut Mashiah Ug'ula (which only exists on HebrewBooks.org for Tazria, Metzora, Aharei Mot, and Kedoshim - so take advantage) quotes the צמח דוד as saying that based on this gemara, we must only be ruled by Xtian rule - and no other religion - in order to be redeemed. That's the idea of the entire kingdom of Edom turning to Minut.
Eretz Yisrael theoretically can be considered ruled by Xian countries as vitually every diplomatic step it takes is done with the authorization of the U.S. and Europe.
The Jews in Morocco, Tunisia, Yemen, India, Turkey and other smaller communities may be exceptions, although the case can be made that those countries too are supported by Xian countries.
The one country where the exception is clear is Iran. The government of Iran is not supported by Xian countries and contains a significant amount of Jews. It's time for them to get out.