"And the ten horns which thou sawest are ten kings; which have received no kingdom as yet; but recieve power as kings ONE HOUR with the beast" (Revelation 17:12, KJV).
The interpretation revealed by 2Peter 3:8 is the key to understanding the Prophecy of Revelation 17:12. It's a clear case of Scripture interpreting Scripture. If you check the Bible commentary, most conservative scholars agree Rev.17:12 relates to these kings as being described as "dictators". Since the European Union never has had, and most likely never will have "ten" dictators, it's pretty clear the prophecy can not be attributed to the E.U, as some theologians suggest. The question is, has such a beast system, (Daniel 7 relates the term "beast' to systems of government), of ten dictators ever occurred in recent historic times ?! The answer is, Yes.
In March of 1947 then President Truman issued his "Policy of Containment" against the Soviet Bloc of Eastern Europe. This was the beginning of the "Cold War era" beast system in history. The Soviet East Bloc consisted of TEN KINGDOMS. NINE Stalinist dictatorships, composed of the U.S.S.R. (which included the Baltic States of Lithuania, Latvia and Estonia that voluntarily became republics of the U.S.S.R. in 1941 and only regained their independence in 1991 after the collapse of the Soviet Union), East Germany, Poland, Bulgaria, Romania, Czechoslovakia, Hungary, Yugoslavia and Albania.
The "iron" as in "Iron Curtain" of Daniels corresponding prophecy, (Daniel 2:40). The TENTH kingdom consisting of the Roman Catholic population of Eastern Europe representing the "miry clay" (identified as infirm spiritual beliefs in Psalm 40:2, such as the worship of the Virgin Mary), and found in Daniel's prophecy as well, (Daniel 2:41-42).
"And whereas thou sawest iron mixed with miry clay, they shall MINGLE themselves with the seed of men: but they shall not CLEAVE one to another, even as iron is not MIXED with clay" (Daniel 2:43).
Here is a perfect and historically accurate description of the polarized ideology of Stalinism and Marianism (the RCC worship of the Virgin Mary). Recently, in 2015 in Bolivia Pope Francis was presented with a sculpture of a Soviet Hammer and Sickle superimposed with a Cross commemorating and celebrating the Vatican's victory over Stalinism in 1991.