ANKARA, TURKEY, AUG. 8 -- Secretary of State James A. Baker III laid the groundwork today to obtain Turkey's permission for use of military bases here if needed to deter Iraq from invading Saudi Arabia, and Baker offered Turkey expanded military and intelligence cooperation from the United States to counter Iraqi threats, officials said.

"In the event that there were to be full-scale hostilities, I'm quite confident that we could count upon our allies, the Turks," an administration official said after Baker met with Turkish President Turgut Ozal. "I think if they know the . . . United States is going to be there for them, they'll be there for the United States."

The official said Turkey "may in fact be increasing" the types of military activities it will permit the United States and other members of the North Atlantic Treaty Organization to conduct here.

A Turkish-American air base at Incirlik, with an estimated 5,000 U.S. military personel and their dependents, is the largest and most important American military facility in Turkey. In recent months, squadrons of F-111 fighter-bombers have been rotating through the base. Although the warplanes arrived prior to Iraq's invasion of Kuwait, their presence has underscored the delicate military and political questions that would be raised about American involvement if the Iraq crisis in the Persian Gulf broadens.

The air base, 375 miles west of Iraq, is currently devoted to NATO defense purposes, although officials made it clear that the United States would like to expand the kinds of activities that could be staged from Incirlik if needed either to deter Iraq or defend Saudi Arabia. The officials were not explicit, however, about what kinds of forces might be used or how they might be deployed.

Baker's meetings appear to be part of a larger strategy that seemed to include Defense Secretary Richard B. Cheney's appeal to Saudi Arabia to allow deployment of a multinational force there.

The administration official, asked if the United States was trying to encircle Iraq with an implied military threat from its neighbors, responded, "You bet."

The official hinted that the circle may soon be tightened by Iraq's bitter enemies, Iran and Syria. "I think it would be useful to keep an eye on what Syria and Iran do in terms of deployments," he said. "If they should happen, I'm sure that they would be noticed in Iraq."

Baker told reporters as he left tonight to meet with other NATO foreign ministers in Brussels, "The United States and Turkey have long cooperated from a defensive standpoint." The administration official added later, "The Turks . . . are to a degree exposed in the event there is any sort of outbreak of hostilities." He added, "I think the Turks see the threat that {Iraqi President} Saddam Hussein represents. I think they see the threat that his long-range missile capability and his chemical weapons capability presents."

However, Ozal continues to be reluctant to commit Turkey to the multinational force now being assembled to defend Saudi Arabia, officials said.

Baker's visit was designed to show support for Turkey following this week's decision by Ozal to shut down an Iraqi oil pipeline and join the United Nations Security Council trade embargo against Iraq.

According to a Western diplomat here, closing the oil pipeline will cost Turkey $400 million and the trade embargo will cost the country another $300 million to $400 million. Turkey has lost hope of recapturing $800 million in debt owed by Iraq and has lost the source of 60 percent of its oil supply and much of the commerce that came through the country en route to Iraq. One diplomat estimated that some large firms in Turkey may go bankrupt as a result of the decision to shut the oil pipeline.

"We certainly recognize the fact that Turkey will lose revenues as a result of implementing these sanctions," Baker said.

Baker said the exiled leaders of Kuwait had "offered to do what they can to minimize those losses" in Turkey. However, U.S. officials said there were no specific amounts yet being discussed.

According to the administration official, the United States has recently written a letter renewing U.S. support for Turkish membership in the 12-nation European Community.

A few hours after Baker departed Ankara, Ozal gave a televised address in which he indicated that Baker had provided firm U.S. assurances of Turkey's national security.

Although Ozal began the 10-minute speech by referring to both Kuwait and Iraq as "our friends," he condemned the invasion and annexation of the emirate and gave his whole support to U.N. sanctions against Iraq.

Ozal said he had told Iraqi First Deputy Prime Minister Taha Yassin Ramadan that "war is not a solution to anything" when he came to Ankara Sunday in a bid to encourage Turkey to remain neutral in the gulf conflict.

Signaling his country's dilemma in responding to aggression by neighboring Iraq, Ozal said Turkey had important economic ties with the West but that the predominantly Islamic country had historic links with the Arab world as well.

Special Correspondent Michael Z. Wise contributed to this report.