After Hamas attacked Israel in October, igniting the Gaza war, Israeli leaders described the group’s most senior official in the territory, Yahya Sinwar, as a “dead man walking.” Considering him an architect of the raid, Israel has portrayed Mr. Sinwar’s assassination as a major goal of its devastating counterattack. Seven months later, Mr. Sinwar’s survival is emblematic of the failures of Israel’s war, which has ravaged much of Gaza but left Hamas’s top leadership largely intact and failed to free most of the captives taken during the October attack. Even as Israeli officials seek his killing, they have been forced to negotiate with him, albeit indirectly, to free the remaining hostages. Mr. Sinwar has emerged not only as a strong-willed commander but as a shrewd negotiator who has staved off an Israeli battlefield victory while engaging Israeli envoys at the negotiating table, according to officials from Hamas, Israel and the United States. Some spoke on the condition of anonymity to discuss sensitive intelligence assessments of Mr. Sinwar and diplomatic negotiations.

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Persons: Yahya Sinwar, Sinwar’s, Sinwar, Sinwar — Locations: Israel, Gaza, United States, Egypt, Qatar