This does not end as you are all postulating.
China and Russia know that Iran is the buffer zone. They will not stand by and let Iran fall over dead.
No one wants Iran to "fall over dead". The sane people of the world have decided that Iran will not have nuclear weapons because their stated goal is to kill all the Jews and remove one of the nations of the earth. They are Satanically obsessed with it. They fooled around, and found out.
According to Trump this morning, the sides are already talking. Israel will NEVER again be disposed from their land.
And I will plant them upon their land, and they shall no more be pulled up out of their land which I have given them, saith the Lord thy God. - Amos 9: 15
(Is. 11:11-12 NASB) Then it will happen on that day that the Lord will again recover the second time with His hand the remnant of His people, who will remain, from Assyria, Egypt, Pathros, Cush, Elam, Shinar, Hamath, and from the islands of the sea. 12 And He will lift up a standard for the nations, and will assemble the banished ones of Israel, and will gather the dispersed of Judah from the four corners of the earth.
First, this cannot refer to the regathering under Ezra and Nehemiah, because he clearly says that they will be regathered “a second time.” Isaiah was writing before the first dispersion under Nebuchadnezzar (8th century B.C.). The return from Babylonian and Assyrian exile was the “first regathering” (Is. 10:20-27; 44:26-45:8). Moreover, this cannot refer to the regathering of the Exodus under Moses, because Isaiah promised a “remnant” will be regathered. The Exodus was not a remnant –rather all of Israel was gathered.
Second, this passage states that this will be a global regathering (“from the islands of the sea… from the four corners of the earth”), rather than a local regathering.