"what happens when there is a terrorist attack from the UN controlled area in gaza?" - your question There might someday be such a thing. But it doesn't exist now and is not currently contemplated. Reread the article, or at least the English version. Like Jason, you seem confused by the proposal of control with outside assistance. In Lebanon, UNIFIL provides assistance to the government, not to Israel.
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CNN: Ex-Texas Gov. Perry endorses Trump, says he's open to VP run (Reuters)
from the article: Gaza is the fuel for Muslim world's anti-Israel struggle