With all the evil in the world, why is the world primarily, almost solely, focused on Jerusalem and Israel today?

Because the God of Israel said it would happen over 2,500 years ago.

Zechariah 12:

² “Behold, I will make Jerusalem a cup of drunkenness to all the surrounding peoples, when they lay siege against Judah and Jerusalem. ³ And it shall happen in that day that I will make Jerusalem a very heavy stone for all peoples; all who would heave it away will surely be cut in pieces, though all nations of the earth are gathered against it.

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U.S. officials coming to Israel to discuss how to handle Iran - Haaretz Daily Newspaper
Two senior U.S. officials will come to Israel next week to discuss plans for new sanctions on Iran in response to the International Atomic Energy Agency's latest report on its nuclear program. Washington hopes to mobilize the European Union and other developed countries to blacklist Iran's central bank.

Russia and China will not cease trading with Iran.