TEL AVIV, Israel>> Israel’s defense minister said Thursday it will take months to destroy Hamas, predicting a drawn-out war even as his country and its top ally, the United States, face increasing international isolation and alarm over the devastation from the campaign in Gaza.

Yoav Gallant’s comments came as U.S. national security adviser Jake Sullivan met with Israeli leaders to discuss a timetable for winding down major combat in Gaza. Israeli leaders repeated their determination to pursue the military assault until they crush the militant group for its Oct. 7 attack.

The exchange seemed to continue a dynamic the two allies have been locked in for weeks. The Biden administration has shown unease over Israel’s failure to reduce civilian casualties and its plans for the future of Gaza, but the White House continues to offer wholehearted support for Israel with weapons shipments and diplomatic backing.

Meanwhile, aside from small adjustments, Israel has changed little in what has been one of the 21st century’s most devastating military campaigns, with a mounting death toll.

The prime minister of the Palestinian Authority, Mohammed Shtayyeh, said it’s time for the United States to deal more firmly with Israel, particularly on Washington’s calls for postwar negotiations for a two-state solution to the Israeli-Palestinian conflict.

“Now that the United States has talked the talk, we want Washington to walk the walk,” Shtayyeh said in an interview with The Associated Press a day before he and Palestinian President Mahmoud Abbas are to meet with Sullivan.

Sullivan was to visit Ramallah for the meeting, where the men will discuss ongoing efforts to promote stability in the West Bank, according to a Biden administration official who spoke on the condition of anonymity because the official was not authorized to discuss the visit, which has not been formally announced.

A deadly Hamas ambush on Israeli troops in Gaza City this week showed the group’s resilience and called into question whether Israel can defeat it without wiping out the entire territory. The campaign has flattened much of northern Gaza and driven 80% of Gaza’s population of 2.3 million from their homes. Displaced people have squeezed into shelters mainly in the south in a spiraling humanitarian crisis.

Gallant said Hamas has been building military infrastructure in Gaza for more than a decade, “and it is not easy to destroy them. It will require a period of time.”

“It will last more than several months, but we will win, and we will destroy them,” he said.

After talks with Sullivan in Tel Aviv, Israeli Prime Minister Benjamin Netanyahu said he told Israel’s “American friends” that the country was “more determined than ever to continue fighting until Hamas is eliminated — until complete victory.”

White House National Security Council spokesman John Kirby said Sullivan talked with Netanyahu about moving to “lower intensity operations” sometime “in the near future.”

“But I don’t want to put a time stamp on it,” he said.

Earlier this week, President Joe Biden said Israel was losing international support because of its “indiscriminate bombing.” U.S. officials have been telling Israel for several weeks that the country’s window is closing for concluding major combat operations in Gaza without losing even more support internationally.

The Palestinian telecommunications provider Paltel said Thursday that all communication services across Gaza were cut off due to ongoing fighting, severing the besieged territory from the outside world.

Heavy fighting has raged for days in areas around eastern Gaza City that were encircled earlier in the war. Tens of thousands of people remain in the north despite repeated evacuation orders, saying they don’t feel safe anywhere in Gaza or fear they may never be allowed to return to their homes if they leave.

The military released footage Thursday showing Israeli troops leading a line of dozens of men with their hands above their heads out of a damaged building it said was the Kamal Adwan Hospital in the north Gaza town of Beit Lahia. Men brought out four assault rifles and set them on the street along with several ammunition magazines.

In the video, a commander said militants had fired on troops from the hospital and that troops were evacuating those inside while detaining suspected militants. Earlier in the week, a Gaza Health Ministry official said weapons inside belong to the hospital’s guards. Neither side’s claims could be independently verified.

Israeli troops have held the hospital since Tuesday, according to the Health Ministry and U.N. During that time, 70 medical workers and patients were detained, including the hospital director, they said.