Israel-Hamas War and Gaza Fighting: Latest News

They said Mr. Netanyahu’s unwillingness to have a serious conversation about the “day after” has made it easier for Hamas to reconstitute itself in places such as Jabaliya in northern Gaza, which Israel first attacked in October — and where it launched a new air and ground assault this week.

Eran Lerman, Israel’s deputy national security adviser from 2006 to 2015, said the backlash Israel is facing from much of the world over the war, and the rising death toll among Palestinians in Gaza, comes in part from “the lack of coherent vision for the day after.”

Prime Minister Benjamin Netanyahu has resisted calls to bring the fighting to an end, arguing that there can be no civilian government in Gaza until Hamas is destroyed. On Monday, in a podcast interview, he said the territory needed “sustained demilitarization by Israel” first, because “no one’s going to come in until they know that you either destroyed Hamas, or you’re about to destroy Hamas.”

But with a growing number of analysts and officials questioning whether Israel can accomplish such a broad goal, the more vocal critique from parts of the military reflects a gradually widening rift with the Netanyahu government.

While Israeli strategists have said they expected troops to go back to some areas of Gaza in later phases of the war, the two Israeli officials said that starting to set up a new governing authority in Gaza would make things more difficult for Hamas — and could lighten the load for the Israeli military.

The military’s leaders “are frustrated that they have been given a military assignment that ends up repeating like Groundhog Day, because the larger strategic and political questions haven’t been answered by the government,” said Michael Koplow, an analyst at Israel Policy Forum.

For Mr. Netanyahu, the political considerations involve trying to hold together a government with right-wing parties that have demanded an all-out assault on Gaza over American objections, and are unwilling to support what Arab countries have demanded as a prerequisite for their help in Gaza: a path to a Palestinian state.

If Mr. Netanyahu veers too far from their demands, they have threatened to topple the government, which could leave Mr. Netanyahu to face a series of corruption allegations without the powers he has as prime minister.

Dr. Lerman, the former deputy national security adviser, recently published a proposed plan with other scholars at the Wilson Center that calls for a multinational authority to administer and police Gaza, led by the United States, Egypt and other nations. It has been shared with Israeli authorities.

Other proposals have included efforts to strengthen the Palestinian Authority that now governs the Israeli-occupied West Bank, but the Israeli government has also rejected that idea, arguing that the authority is not a competent, credible partner.

Former Israeli officials sounded warnings about a lack of postwar planning even before the ground assault in Gaza began. On Oct. 14, a week after the devastating Hamas-led attack that killed 1,200 people, Israeli officials say, and touched off the Israeli military offensive, Tzipi Livni, a former foreign minister, called on the government to consider Gaza’s postwar future.

“Otherwise,” she said, “we would get stuck there unnecessarily and with a heavy price tag.”

In an interview Tuesday, she said this was exactly what had happened.

“Just imagine if we had decided this before, and started working earlier with the U.S., the Palestinian Authority, Egypt, the U.A.E. and the Saudis,” she said, referring to the United Arab Emirates. “It would be much easier.”

Johnatan Reiss and Gabby Sobelman contributed reporting.