Yahya Sinwar Helped Start the Gaza War. Now He’s Key to Its Endgame.

Hamas’s leader in Gaza is considered an architect of the Oct. 7 attacks that prompted Israel to retaliate. As mediators

Yahya Sinwar Helped Start the Gaza War. Now He’s Key to Its Endgame.

Hamas’s leader in Gaza is considered an architect of the Oct. 7 attacks that prompted Israel to retaliate. As mediators seek a cease-fire, a deal depends on Mr. Sinwar as well as his Israeli foes.