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"An envoy from the US will attend weekend talks with Iran and other major powers over Tehran's nuclear programme.
The announcement on Tuesday that William Burns, the US under-secretary of state, is to attend a meeting in Geneva with Saeed Jalili, Iranian nuclear negotiator, is a switch in position for the US.
Burns will join Javier Solana, the EU foreign policy chief, and envoys from China, Russia, France, Britain and Germany, at the meeting, due on Saturday.
They will discuss Iran's response to an offer made by world powers last month to give up nuclear work that the West believes is aimed at building an atomic bomb and Tehran says is for peaceful power-generation purposes.
Washington said that Burns would not act as a negotiator and not meet Jalili separately.
He is to put forward the White House position that Iran must give up enrichment for any talks to start.
The US had said previously it would not be involved in any pre-negotiations with Tehran unless it gave up uranium enrichment."
more Iran and US eye diplomatic opening<
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"After last week's show of force by Iran, now there are growing signs that both Iran and the United States want to do some serious talking about the nuclear crisis. After the harsh rhetoric and the threats, it is a critical moment for diplomacy.
Washington has shown it means business by agreeing to send the Under-Secretary of State, William Burns, to Geneva to join talks between the European Union's foreign policy chief, Javier Solana, and Iranian negotiator Saeed Jalili on Saturday.
It is a major shift by the Bush administration, and the Iranians will understand that.
Earlier this week, President Mahmoud Ahmadinejad said he was interested in direct talks with the US.
He also said Iran was interested in an idea being floated in Washington - to open a US diplomatic mission in Tehran for the first time since the revolution.
In intriguing comments in a television interview on Monday night, Mr Ahmadinejad said he expected "something may happen soon" in US-Iranian relations."
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