Who is Hamas leader Yahya Sinwar, and what does he want?

Israel’s national security adviser says the top Hamas leader in Gaza, whose name is Yahya Sinwar is “living on borrowed time.” Sinwar is believed to be the mastermind behind the Oct. 7 attack on Israelis. He would also have to sign off on any ceasefire deal to release the remaining hostages held in Gaza. The World’s Matthew Bell reports. 

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