Why are people of the perception that Israel is invincible? What would they be without US financial and military (as in supplies) support?

They've never ne a war that wasn't on it's borders. Do people reall think they could take down Russia? China? or even Iran?
Update: That should say they've never *WON* above
Update 2: I agree with those who say they've only won defensive wars, but what I'm getting at is tht they could never win a ground war in Turkey or Iran for example.
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