Dan 7:7 "After this I saw in the night visions, and behold, a fourth beast, dreadful and terrible, exceedingly strong. It had huge iron teeth; it was devouring, breaking in pieces, and trampling the residue with its feet. It was different from all the beasts that were before it, and it had ten horns"
This fourth Beast (possibly an Alliance of nations) is different from all the other Beasts (empires). It is dreadful and will destruct everything in its path. What then can this dreadful, destructive and powerful beast be?
Dan 7:8, 11, 13 "I was considering the horns, and there was another horn, a little one, coming up among them, before whom three of the first horns were plucked out by the roots. And there, in this horn, were eyes like the eyes of a man, and a mouth speaking pompous words...
I watched then because of the sound of the pompous words which the horn was speaking; I watched till the beast was slain, and its body destroyed and given to the burning flame. I was watching in the night visions, and behold, One like the Son of Man, coming with the clouds of heaven! He came to the Ancient of Days, and they brought Him near before Him."
This looks like an endtime event where the Antichrist seated in the temple of God will be killed by the glorious coming of our Lord Jesus at rapture.
2Thess 2:8-9 And then the lawless one will be revealed, whom the Lord will consume with the breath of His mouth and destroy with the brightness of His coming. The coming of the lawless one is according to the working of Satan, with all power, signs, and lying wonders,
Dan 2:40 And the fourth kingdom shall be as strong as iron, inasmuch as iron breaks in pieces and shatters everything; and like iron that crushes, that kingdom will break in pieces and crush all the others.
Since this is an endtime prophecy leading to rapture, this dreadful, terrible and devastating event can only be World War 3, where the Antichrist hybrid will annihilate Israel and all its enemies.
Dan 11:40-41a “At the time of the end the king of the South shall attack him; and the king of the North (Antichrist) shall come against him like a whirlwind, with chariots, horsemen, and with many ships; and he shall enter the countries, overwhelm them, and pass through. He shall also enter the Glorious Land, and many countries shall be overthrown...
As soon as the Southern Alliance (Israel and Egypt supported by Saudi Arabia and other Sunni Arab nations) attack Iran, the head of the Northern Alliance (king of the North) will start World War 3 likely in 2018.
The Northern Alliance will retaliate and attack the neighbouring Arab nations and the military bases of the West. This will prompt the US fifth Fleet based in the Arabian Sea to attack Iran with missiles, fighter jets and bombers. The Antichrist using his demonic power will then divert all these arsenals to populated cities. The whole world will blame the death of hundreds of thousands of innocent Iranian civilians on the US and the West. The rest of the world will support Iran to fight the West.
Dan 11:44 "But news from the east and the north shall trouble him; therefore he shall go out with great fury to destroy and annihilate many"
Australia, which is East of Iran will send military to support the West. Australia will be annihilated.
EU (Northwest of Iran) will attack Iran but they too will be annihilated.
Note – Russia, an ally of Iran is North East of Iran.