In a later appearance in the White House East Room, Netanyahu said he sought “a peace that will last for generations.”

“I came here today to find a historic compromise,” he said. “I’ve been making the argument for Israel all my life. I didn’t come here today to make an argument; I came to make peace. I didn’t come to find excuses, or make them. I came to find solutions.”

Turning to Abbas, he said, “President Abbas, you are my partner in peace.” But he also signaled that Israel would insist on strong controls over security in Palestinian territory.

Abbas promised that Palestinians would “work diligently and tirelessly” to make the talks succeed. But he said Israel must freeze all settlement construction in the occupied West Bank.

Obama later hosted the two at a White House dinner with the leaders of Egypt and Jordan as a prelude to direct talks Thursday between Abbas and Netanyahu. Thursday’s session marks the first face-to-face meeting between Palestinians and Israelis since talks broke down nearly two years ago.

Obama said there had been indications of confidence-building efforts between the two sides prior to the new round of talks, which are to include top-level meetings at two-week intervals.

In voicing a measure of optimism, Obama reflected a view among administration officials and independent experts that there may be a basis for negotiations leading to establishment of a Palestinian state that would coexist with Israel.

One reason is that, despite the slayings Tuesday of four Jewish settlers near Hebron, in the West Bank, and an attack that injured two others Wednesday near Ramallah, Palestinian violence now is at a lower level than it often has been.

In addition, Abbas’ government in the West Bank has been improving its security forces, judicial system and other institutions, as well as the territory’s economy. The Palestinian Authority leadership, including Prime Minister Salam Fayyad, is considered relatively moderate and is well-regarded by the West.

Intensive involvement by the Obama administration, in contrast to the more hands-off approach by the Bush administration, is seen as another positive factor.

Added to that is the sheer question of time. U.S. officials believe that if the two sides do not move quickly, continued Jewish building in the West Bank and continued polarization will eliminate the possibility of completing a peace deal culminating in creation of a Palestinian state.

“There is a window of opportunity, a moment in time within which there remains the possibility of achieving a two-state solution,” George Mitchell, the U.S. peace envoy, said Tuesday.

Some Israelis also have struck an optimistic new tone. Ehud Barak, the Israeli defense minister said this week that he believes a deal is possible, and said he could foresee a solution to perhaps the most emotional issue of the talks — the division of Jerusalem.

“West Jerusalem and 12 Jewish neighborhoods that are home to 200,000 residents will be ours,” Barak told the Israeli newspaper Haaretz. “The Arab neighborhoods in which close to a quarter-million Palestinians live will be theirs.”

Mideast experts believe that even if the peace negotiations stall, the effort can work to the benefit of the administration by enhancing U.S. credibility around the world.

The talks “help defuse criticism, help put this issue on the side, move on to other issues, and also gives the administration enhanced credibility because it says this is an issue that’s identified as a national priority,” said Robert Danin, a former U.S. official and advisor to Tony Blair, the former British prime minister who now serves as an emissary to the Middle East on behalf of the United States, the European Union, the United Nations and Russia. Danin is now with the Council on Foreign Relations in Washington.

At the White House on Wednesday, Obama met separately with Netanyahu and Abbas, and also with Egyptian President Hosni Mubarak and Jordanian King Abdullah II. Those leaders have come to Washington in a show of Arab support for a peace deal, a display meant to back Abbas in the talks.

The leaders met again Wednesday evening at the White House’s old Family Dining Room for what was described as a working dinner.

When Abbas and Netanyahu meet Thursday, they will resume a process of formal negotiations that has been on intermittently and without success for almost 20 years, since the administration of President George H.W. Bush.

Obama offered no explanation of how the two sides could navigate around the first big threat to the talks: their disagreement over further Israeli settlement in the West Bank.

Netanyahu has indicated he is reluctant to extend a partial Israeli building moratorium that ends Sept. 26. Abbas has insisted that he will not sit at the table without a continuation of the freeze.

There were also dire signals that extremists will do what they can to derail the effort.

In a joint appearance earlier in the day, Obama and Netanyahu condemned the killing Tuesday of four Israeli settlers by gunmen near Hebron. Late Wednesday, two Israelis were hurt in a second shooting incident.

Obama said it was a reminder as talks resume that “enemies of peace will do everything in their power to destroy this effort.”

paul.richter@latimes..com

cparsons@latimes.com