The low-boil conflict between Israel and Iran has shaped the Middle East for decades. Of the many conflicts that have roiled the region, theirs has long been among the most explosive. The two have attacked each other — mostly quietly and in Iran’s case often by proxy — while avoiding an escalation into direct war.

Lebanon’s Hezbollah militant group said Friday it is entering a new phase in its fight against invading Israeli troops, as the region continued to reckon with Israel’s claim that top Hamas leader Yahya Sinwar has been killed in a battle with Israeli forces in Gaza the previous day.