The two hundred million demons now bound at the Euphrates River in Iraq, will be released for the purpose of destroying one-third of humanity. They will not attack the anti-christ. (Revelation 9:14-16, It said to the sixth angel who had the trumpet, “Release the four angels who are bound at the great river Euphrates.” 15 And the four angels who had been kept ready for this very hour and day and month and year were released to kill a third of mankind. 16 The number of the mounted troops was twice ten thousand times ten thousand. I heard their number).
The "Kings of the East" spoken of in Revelation 16:13-16, are the seven kings who have been under the authority of the Antichrist since the middle of the Tribulation.
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