JERUSALEM, SEPT. 19 -- The Bush administration has promised to deliver additional F-15 fighter jets, Patriot air defense missiles and supplies of ammunition to Israel to counter sales of arms to Arab states, but has deferred action on Israel's request for more than $1 billion in new military aid, officials here said today.

Returning from a trip to Washington, Defense Minister Moshe Arens said "there are signs that Washington is beginning to understand Israel's needs" as a result of the Persian Gulf crisis, Israeli radio said. However, official sources said the results of Arens's meetings with Defense Secretary Richard B. Cheney and other officials earlier this week fell short of Israel's expectations.

{Asked about Israeli accounts of Arens's visit, State Department spokesman Margaret Tutwiler said only that the entire issue remains "under discussion."}

"All together, it is not what was expected," a senior official said of the U.S. response to Israel, which contends that plans for massive sales of American arms to Saudi Arabia will upset the balance of power in the Middle East unless Israel is compensated. "It is more than nothing, but not yet what we feel is needed."

Officals here said, and Arens generally agreed, that Cheney promised Arens that the United States would lease Israel 15 F-15A and F-15B warplanes on a long-term basis, as well as two batteries of the Patriot air defense system, which can be used to intercept missiles. Arens also was told that Israel will receive 10 CH-53 cargo helicopters, but officials here said that arrangement predates the gulf crisis.

The terms of the lease arrangement were not disclosed, but Israeli officials have said in the past they cannot afford to pay for new weapons and in effect hoped to get them free from the United States.

Cheney, who called Arens out of a congressional meeting just before he was due to leave Washington, also said the United States would increase the amount of ammunition it stores in Israel for possible use in a crisis, officials said.

However, the sources said that the Pentagon deferred any answer on Israeli requests for additional F-16 planes and turned down Israel's appeal for "real-time" sharing of U.S. intelligence data picked up by satellites over the Middle East. Officials said Arens also got no answer to a request that the United States immediately give Israel $1 billion in "emergency" military aid, and increase its regular annual military assistance from $1.8 billion to $2.5 billion. In recent years, the United States has "forgiven" the full cost of the weapons purchased by Israel -- and Egypt -- with U.S.-provided credits, in effect giving them the arms free.

According to Israeli radio, Arens predicted Israel will eventually get what it requested from the United States. However, some senior government officials said Cheney appeared to have pulled together a relatively small assistance package at the last minute just to prevent the appearance that Arens was leaving Washington empty-handed.

Arens was among a parade of Israeli ministers who have gone to Washington to seek emergency financial assistance. He has visited the Pentagon twice in the past month, while Foreign Minister David Levy was in Washington last week and Finance Minister Yitzhak Modai will arrive Sunday.

In addition to the costs of the gulf crisis, Israel is trying to raise money to absorb the tens of thousands of Soviet Jewish immigrants pouring into the country. Officials have estimated that Israel may need $22 billion to pay for the immigration over the next several years, a sum that is equal to more than half the country's annual gross national product.

In addition to deferring Arens's requests, U.S. officials reportedly reacted coolly to a request by Levy for forgiveness of some $4 billion in Israeli debts to the United States. Levy also has been unable to win final White House agreement for disbursement of $400 million in loan guarantees for Israel's housing construction program for immigrants, even though the money already has been appropriated by Congress.

Some Israeli news media speculated that the Bush administration has been slow in reacting to Israel's requests because it hopes eventually to extract concessions from the government of Prime Minister Yitzhak Shamir on possible peace talks between Israel and the Palestinians. Levy, who met Secretary of State James A. Baker III in Washington earlier last month to discuss the peace process, is due to meet him again at the coming U.N. General Assembly session in New York, and reportedly has promised to put forward new proposals.

In answer to such reports, Arens and other officials stressed today that the issue of Israeli-Palestinian talks had not been mentioned during his latest talks in Washington. But one senior official added, "You can perhaps make that connection, although nothing has been openly said about it."