I think the warning is for real. Israel would much prefer to see the missiles withdrawn than to have to fight a regional war with only token support from the U.S. They also want third-party pressure against Syria to back off.
diego garcia
A wonderful book to read is “AS AMERICA HAS DONE TO ISRAEL, BY John P McTernan”
After reading this book, I no longer fear what will happen to Israel, it is too bad that America is not standing with Israel, especially with the curreent President we have, appaently he has not read the Holy Bible, so he would prefer to stand with Muslim terrorist than stand with Israel