You are saying that China, Russia and Iran are three horns that are being removed to make way for the antiChrist. What is the scriptural basis for your belief?
Daniel 7:8 I considered the horns, and, behold, there came up among them another little horn, before whom there were three of the first horns plucked up by the roots: and, behold, in this horn were eyes like the eyes of man, and a mouth speaking great things.
There are several interpretations, the one I think is best is that the Antichrist's kingdom will be divided into the ten regions the UN is now dividing the Earth up into. Each kingdom is considered a horn. India has a horn, we saw them just destroy Pakistan's air defense. But the Antichrist is called a "little horn" meaning little or small. I realize there are several Biblically valid interpretations concerning the Antichrist. I would not doubt that his lineage includes someone that would allow us to refer to him as "the assyrian" but I highly doubt that is a reference to a ruler of Syria or Iraq. No I think the best guess is that he will be a ruler in Europe. He can be a president, but he has to also be a prince or king. But here is the thing, he is a "small" horn compared to the three that are removed. A European leader would be considered a "small horn" compared to the US, China and Russia.
But that is not the only basis for this "educated guess". The other is many, many prophecies that indicate a time frame for this age is coming to an end. If the end of the age were still a hundred years away it would be different, but how is it that the US is not mentioned in Revelation (personally I think that The Great Babylon is a reference to the US being destroyed at the start of the seventieth week) and China is also not mentioned (though you can argue that the armies from the East are a reference). Russia is mentioned, they are Gog, but they lead an all or nothing attack on Israel in the Ezekiel 38 war and they are defeated. So those are three horns bigger than a European leader, say Emmanuel Macron (who is also a prince of Andorra). It would explain why they are not mentioned more, because they got removed to make way for the Antichrist.
The chances of them "taking down the US with them" as their economic power diminishes, is almost zero.
Ridiculous 100 well trained men could bring down the entire electric grid of the US for two years. That would require ten companies of ten men, properly armed to attack specific electric substations which are not fortified against such attacks. According to the US internal estimates such an event would cause 90% of Americans to die. And/Or we could see suitcase nukes set off in ten locations. This would require less than 100 men to pull off but would require access to these sophisticated bombs. We have been told by high level Russian defectors that these ten suitcase nukes are already in the US and have been here for over two decades. Then of course there is the nuclear Poseidon torpedo from Russian subs. We can't stop those. They create huge radioactive tsunamis that will heavily damage an area along our coastlines. 65% of all Americans live within 5 miles of the coast, so a coordinated attack like this would be utterly devastating and crippling.
But forget about these people, God can hit the US with a meteor that will do the same thing.
Since I believe that Revelation 18 refers to God's judgement on the US at the start of the seven year period commonly referred to as "the tribulation" I do not even factor in the economic power of our enemies.
You continue to imagine a world where children must hide under desks each day in school, to practice for a coming annihilation.
Hiding under a desk would be idiotic, nor have I ever suggested that would be a good tactic. The only reference I have made to a nuclear attack on the US is suitcase nukes since it is harder to pin those on a country. Those will take out about ten city blocks, a very small portion of a city the size of NYC, and for the rest of the kids in school it would be idiotic to be hiding under a desk. I have also mentioned the nuclear torpedos of Russia called "Poseidon" that cause a Tsunami. Again, if a Tsunami were coming hiding under a desk would be foolish for all but perhaps a very select few located in schools facing the ocean, in a classroom facing the ocean without enough time to get to the hallway so you can stand behind the wall.
Are you SDA? Mormon? JW? Southern Baptist?
What fuels such fears? No, No, No, simply a born again Christian who believes the word of God.