WASHINGTON: Having twice failed to achieve Israeli-Palestinian peace, the Obama administration is discussing ways to help preserve the prospect of an increasingly threatened two-state solution, United States (US) officials said.

One possibility under discussion is to issue an outline of a deal to end the nearly 70-year-old conflict on such matters as borders, security, the status of Jerusalem and the fate of Palestinian refugees.

Such an outline could range from a brief description of core tradeoffs the two sides might need to make to a detailed set of "parameters" like those that former US President Bill Clinton laid out for the parties in late 2000.

Under one scenario, the outline could be enshrined in a United Nations (UN) Security Council resolution to give it greater international standing for a future US president or the parties whenever they might resume peace talks that collapsed in April 2014.

"It's one of the ideas that they are talking about," said a US official who spoke on condition of anonymity.

Resorting to a UN resolution would require a major shift in long-standing US policy, which has mostly opposed use of the UN as a forum for pressuring Israel. The US has repeatedly insisted it is up to the two sides to directly negotiate over their differences.

Another possibility would be for US President Barack Obama to make a speech laying out his principles for a settlement.

US officials have no expectation peace talks will resume before the end of Obama's term in January 2017 and they played down the odds of any quick decision on how the White House might help preserve a two-state solution.

"People in the government are asking the question what can we do to keep the two-state solution alive, and they're generating ideas," said a senior US official.

The ideas had not yet risen to senior White House staff and Obama is focused on other issues including militant Islamic State group, Iran and Cuba, the officials said.

Two separate peace efforts, by George Mitchell and US Secretary of State John Kerry, have failed during Obama's seven years in office.

Two-state solution dying on Obama's watch?

A two-state solution long seen as the most internationally acceptable outcome envisages a Palestinian state on most of the West Bank and Gaza Strip, lands Israel captured in a 1967 war, and an Israeli state that absorbs some of the settlements Israel built on occupied land in return for mutually agreed land swaps.

Such a solution appears remote because of ongoing Jewish settlement building; a split between the Palestinian Fatah and Hamas factions; preoccupation within the Palestinian Authority about who may succeed 81-year-old President Mahmoud Abbas; and a wave of Palestinian stabbings, shootings and car rammings of Israelis.

The Palestinian attacks have killed 28 Israelis and two US citizens since October, while Israeli forces have killed at least 179 Palestinians, 121 of whom Israel says were assailants.

Current and former US officials have warned that a failure to break the impasse could lead to greater conflict and that continued occupation of Palestinian land puts at risk Israel's character as a Jewish and democratic state.

Former officials also cite a deepening cynicism on both sides regarding peace, making it ever harder to achieve.

"In the absence of negotiations, actions on the ground are making it more and more difficult to see how a two-state solution could be achieved," said Martin Indyk, Obama's former special envoy for the Israeli-Palestinian negotiations.

"I think there is a real concern on the part of the president and the secretary of state," said Indyk, who is now executive vice president of the Brookings Institution think tank, "that instead of achieving a breakthrough to a two-state solution, the two-state solution will die on their watch."