Despite Israel's stance, the U.S. and France sought to keep prospects alive for an immediate 21-day truce they proposed on Wednesday, and said negotiations continued, including on the sidelines of a United Nations meeting in New York.

An Israeli warplane struck the edges of the capital Beirut, killing two people and wounding 15, including a woman in critical condition, Lebanon's health ministry said. That took deaths overnight and on Thursday to 28 and over 600 since Monday.

The strike killed the head of one of Hezbollah's air force units, Mohammad Surur, Hezbollah said, the latest senior Hezbollah commander to be targeted in days of assassinations among the group's top ranks.

On the Israeli side of the border with Lebanon, the army staged an exercise simulating a ground invasion - a potential next stage after relentless airstrikes and explosions of communications devices.

Israel's air force is planning to assist troops in the event of a ground operation and will stop any arms transfers from Iran, Air Force Commander Major General Tomer Bar said late on Thursday.

"We are preparing shoulder to shoulder with Northern Command for a ground maneuver. Prepared, if activated. This is a decision to be made above us," he told soldiers in a video distributed by the Israeli military.

Israel has vowed to secure its north and return thousands of citizens who have evacuated since Hezbollah launched a campaign of cross-border strikes last year in solidarity with Palestinian militants fighting in Gaza.

Arriving in New York before addressing the U.N. General Assembly on Friday, Israeli Prime Minister Benjamin Netanyahu told reporters the military will keep hitting Hezbollah with "full force and we will not stop until we achieve all our goals, first and foremost returning the residents of the north safely to their homes."

Israeli Foreign Minister Israel Katz said on X, "There will be no ceasefire in the north."

Israel's stance dashed hopes for a swift settlement and Lebanese Foreign Minister Abdallah Bou Habib appealed to the U.N. to win an immediate ceasefire "before the situation spirals out of control, with a domino effect, making this crisis impossible to contain."

"Lebanon is currently enduring a crisis which is threatening its very existence," Bou Habib said at a meeting of the U.N. General Assembly late on Thursday.