$SIREN Israel allegedly said that they will not join any U.S. ground operation in Iran. This is a very significant message from a key ally.

This changes the calculus significantly for any proposed operation. The U.S. has often relied on regional partners, but Israel is making it clear that a ground war is their line in the sand. It shows that even close allies have independent national interests and aren't afraid to say "no."

Israel is basically telling the U.S. that while they share intelligence and goals, a ground invasion is a bridge too far for them to cross.