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Oded Balilty, Associated Press
Palestinian women react to tear gas fired by Israeli soldiers during a demonstration against the expansion of nearby settlements at the West Bank village of Dier Qadis, near Ramallah, Wednesday, June 15, 2011. Top U.S. diplomats have returned to the Middle East for an unannounced visit to try to find a way to restart moribund Israeli-Palestinian peace talks, which collapsed last year and now face new challenges.

JERUSALEM — Senior U.S. diplomats have returned to the Middle East for an unannounced visit to try to find a way to restart Israeli-Palestinian peace talks that collapsed last year and now face new challenges.

Dennis Ross and David Hale's visit, confirmed by Israeli and Palestinian officials Wednesday, is their first to the region since special Mideast envoy George Mitchell resigned last month after failing to break the negotiations deadlock.

The first big challenge for the U.S. envoys is to find a formula for talks that would entice the Palestinians to drop their bid for unilateral recognition of a Palestinian state at the United Nations in September. The Palestinians, who hope to establish a state in the West Bank, east Jerusalem and Gaza Strip, adopted that strategy in frustration over the impasse.

"There are talks going on to see if there's a formula that will allow for the restarting of the talks that would cause the Palestinians to abandon their unilateral approach," said another Israeli official.

Both Israeli officials spoke on condition of anonymity because the visit was not announced publicly.

Palestinian Prime Minister Salam Fayyad's office confirmed he met with Hale and Ross but did not release details.

They also met Israeli Prime Minister Benjamin Netanyahu Wednesday and discussed ways to renew peace talks, Israel Radio reported. Palestinian officials said the envoys would travel to Jordan to meet Palestinian President Mahmoud Abbas on Thursday.

The latest round of peace talks collapsed in September, just three weeks after their launch, with the expiration of an Israeli moratorium on Jewish settlement building in the West Bank.

The Palestinians refused to negotiate without a new moratorium that would also include east Jerusalem, and Israel would not yield to that demand. The Palestinians say there is no point in negotiating if Israel continues to build homes in Jewish enclaves inside territories claimed by the Palestinians. Israel counters that the talks should resume without preconditions, and settlements should be one of the topics to be discussed.

Since the breakdown, the Palestinians have forged ahead with plans to seek U.N. recognition for a state, with or without a peace deal with Israel. That effort faces major obstacles, not least because the United States, which opposes it, has veto power on the Security Council, which must approve new member states.

The U.S. has indicated it will use its veto, though it hasn't explicitly said so, with President Barack Obama saying the unilateral campaign for U.N. recognition will not help peace efforts in the region.

The Palestinians have said they would prefer to resume negotiations, but plan on pushing forward with their campaign at the U.N, regardless of U.S. pressure.

"The efforts are focused now on how the issue (of U.N. recognition) could pass through the Security Council without colliding with a veto," Palestinian negotiator Saeb Erekat told reporters in Cairo on Wednesday.

Also complicating any return to negotiations is an emerging reconciliation agreement between Abbas' Western-backed Fatah group, which governs in the West Bank, and the Hamas militant group that rules Gaza. The sides have been trying to negotiate the makeup of a new Cabinet since announcing last month's reconciliation agreement, meant to end a four-year rift.

Israel has said it would not negotiate with a Palestinian leadership that includes Hamas, which doesn't recognize Israel's right to exist and has killed hundreds of Israelis. Israel has urged the Palestinian president to abandon the unity deal and instead resume negotiations.

Associated Press writer Maamoun Youssef contributed to this report from Cairo, Egypt.

Goldenberg can be reached at www.twitter.com/tgoldenberg