ANKARA, Turkey — Iran’s foreign minister said today that forthcoming nuclear talks at Geneva and the participation of a U.S. diplomat for the first time look positive and he expects progress.

America’s undersecretary of state for political affairs, William Burns, was expected to attend the talks at Geneva on tomorrow — the first time America has had such a presence — and join colleagues from other world powers to meet with Iran’s chief nuclear negotiator.

“The new negotiation process (and) the participation of a U.S. diplomat look positive from the outset, but we hope that is reflected in the talks,” Mr. Mottaki told a joint news conference with the Turkish foreign minister, Ali Babacan.

He said the presence of America’s representative “is a new positive approach.”

Meanwhile, Mr. Burns met today for about 20 minutes with the International Atomic Energy Agency head, Mohamed Elbaradei, to discuss Iran’s contentious atomic program. He did not speak to reporters before leaving.

America has shifted from its confrontational policy of isolating Iran in favor of a diplomatic approach.

America’s administration is also floating a proposal to open a de facto American Embassy in Tehran. American diplomats would go to Iran for the first time in almost 30 years, since the countries broke relations after the 1979 Islamic revolution

“I think there might be an agreement both on the issue of opening a U.S. interest protection bureau in Iran and on the issue of direct flights to Iran,” Mr. Mottaki said.

The six-nation group — the group of five permanent members of the U.N. Security Council: Britain, China, France, Russia, America, and Germany — has offered Iran incentives to halt activities that could lead to development of nuclear weapons.

American officials say Mr. Burns will be listening, not negotiating, at the meeting that they insist is a “one-time event.” But his mere presence signals a significant change in President Bush’s approach toward Iran, a charter member of what he termed the “axis of evil” in 2002.

Secretary of State Rice said yesterday that “the United States is firmly behind this diplomacy, firmly behind and unified with our allies and hopefully the Iranians will take that message.”

Washington insists it will not negotiate with Iran as it has with North Korea until Tehran halts enriching and reprocessing uranium. But it is supporting an effort led by the European Union foreign policy chief, Javier Solana, that would allow early talks with others in the six-nation group before such a step.

Iran has rebuffed the attempt to persuade it to stop enrichment and reprocessing, which can produce the key ingredient for atomic weapons, and insists its nuclear program is designed only to produce electric power. Others, particularly America and Israel, maintain it is a cover for weapons development.

As part of its diplomatic efforts, the American administration is also floating a proposal to open a de-facto American Embassy in Tehran. American diplomats would go to Iran for the first time in almost 30 years, since the countries broke relations after the 1979 Islamic revolution.

Mr. Mottaki, however, insisted on specifically calling an American mission “a U.S. interest-protection bureau,” instead of a diplomatic mission.

Turkey, a close American ally, supports Iran’s right to develop nuclear energy for peaceful use but calls on Tehran to be transparent about its controversial nuclear program.

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Associated Press writer Selcan Hacaoglu contributed to this report.