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Israeli officials appear to have throttled back on their threats after facing an unusually sharp backlash from key ally Washington, including the U.S. military chief, Gen. Martin Dempsey, effectively ruling out American backing for an Israeli strike at this time. The Obama administration, instead, urges for time to let tightening sanctions choke off the Iranian economy.

Military analysts say air strikes would likely bring only setbacks, but no permanent blows, to Iran’s nuclear program. It also could send oil prices skyrocketing and put U.S. troops in the Gulf under threat — unsettling scenarios for the White House in an election year.

White House press secretary Jay Carney said earlier this week that “a diplomatic process” remains the best route to reach a “completely verifiable” agreement with Iran not to seek nuclear arms. “But that window will not remain open indefinitely,” he added.

Iran’s main allies on the Security Council also have intensified calls to keep the talks on track. Russia’s Deputy Foreign Minister Sergei Ryabkov said Friday that more meetings are expected to try to end the current impasse. “It’s very important not to lose the momentum,” he said.

In Beijing, Foreign Ministry spokesman Hong Lei this week urged Iran to reach accords with the U.N.’s International Atomic Energy Agency over inspections that could clear the way for more nuclear talks. A main obstacle is U.N. demands for greater access to the Parchin military complex near Tehran to probe suspicions that Iran carried out blast tests that could be intended for a nuclear trigger. Iran denies the claims but has yet to agree to open up the site for wider inspections.

“Nuclear talks are mostly likely going nowhere unless there is an agreement on the guidelines for inspections,” said Scott Lucas, an Iranian affairs expert at Britain’s Birmingham University. “You need a protocol for U.N. inspections of nuclear sites. Otherwise, it’s hard to see the negotiations resuming.”

It’s also unclear how much Ahmadinejad is empowered to discuss the stalled talks during his coming visit to the U.N.

Iran’s nuclear negotiations are overseen directly by Supreme Leader Ayatollah Ali Khamenei, who has largely pushed Ahmadinejad to the political margins after he tried to challenge the near-absolute power of the ruling theocracy. Ahmadinejad cannot independently set Iranian policies, but he remains the international face of Iran and his remarks at the U.N. and other forums are interpreted as messages from the ruling clerics.

Statements earlier this week suggest he may use the U.N. stage to press Iran’s demand that lifting sanctions must be part of the nuclear negotiations.

On a live TV talk show, Ahmadinejad acknowledged that the oil and banking sanctions have presented “barriers” to Iran’s economy. “It is an all-out, hidden, heavy war” to force concessions on Tehran’s nuclear program, he said.

Nicholas Burns, a former No. 3 official at the State Department, said failure to restart the negotiations between Iran and the five permanent Security Council members plus Germany should not be considered the last option for Washington. Burns, now a professor of diplomacy and international politics at Harvard’s Kennedy School of Government, said that could lead to “a final attempt” at direct talks with Tehran.

“It is in our interest to seek direct U.S.-Iran talks,” he said, “to determine whether or not there is a diplomatic solution short of war.”

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Associated Press writers Nasser Karimi in Tehran, Iran, and George Jahn in Vienna contributed to this report.