Yalkut Shimoni Yishayahu Remez 499 - "Rabbi Yitzchak said: The year that the Messiah will be revealed, all the kings (leaders) of the nations will be struggling against each other. The leader of Persia (Iran) will contest with the leader of Arabia, and the leader of Arabia will go to Edom (US) to get council from them (this has already occurred). The leader of Persia will respond and destroy the entire world (this is more likely to be an EMP attack than a full out nuclear attack). All the nations of the world will be trembling and shaking and falling on their faces. They will be seized by pains like labor pains. The Jewish people will be trembling and quaking and saying: "Where can we go? Where can we go?" And Hashem will say to them: My children, do not fear! Everything I did, I did only for you! Why are you frightened? Don't be afraid--the days of your redemption have arrived!"
Additional note. Somebody recently sent me a video of a Rav who believes that Korea is Magog. One of the comments below the video was from a Korean who mentioned that the Korean word for America is “Migug.” I told this to a Jewish friend of mine who happened to speak Chinese, and he told me the word for America in Chinese is “Měiguó.” Cute.