TEHRAN, Iran (AP) -- Iran insisted Tuesday it will resume some nuclear activities that were suspended in an attempt to gain international confidence, but indicated it will not restart uranium enrichment as long as talks continue with European negotiators.

Foreign Ministry spokesman Hamid Reza Asefi said Iran will resume ''some" nuclear activities, but gave no details.

''What activities or when is still under study," and will be announced later, Asefi told reporters.

France, Britain and Germany, acting on behalf of the 25-nation European Union, are seeking guarantees from Iran that it will not use its nuclear program to make weapons, which Washington suspects is its goal. The latest round of talks yielded no results.

Enriched uranium can be used to produce warheads, but it also can be used in the production of electricity, which Iranian officials insist is the sole purpose of their nuclear program.

Iran's top nuclear negotiator Hasan Rowhani said last week that the Tehran regime expected to restart some uranium reprocessing activities at its uranium conversion facility in Isfahan within a week although he said no date had been set.

But he added that the Islamic Republic was unlikely to resume actual uranium enrichment -- injecting uranium gas into centrifuges -- at its plant in Natanz.

''The discussion now is not about resuming uranium enrichment but about carrying out some activities. Uranium enrichment will remain the last option after all other options have been exhausted," Asefi said.

He did not elaborate, but appeared to be referring to the Iranian-European talks.

Iran has said repeatedly that its November decision to suspend all uranium enrichment-related activities was voluntary and temporary. The Europeans have been offering economic incentives in the hope that Iran will make its suspension permanent.

On Monday, U.N. Secretary-General Kofi Annan urged states like Iran to step back from the nuclear temptation as he opened a monthlong conference in New York that is to review how well the Nuclear Nonproliferation Treaty is keeping the lid on atomic weapons.

Asefi said Iran expected the New York conference to also focus some attention on protecting nuclear facilities from military strikes.

Israel has warned it might consider a pre-emptive strike against Iran's nuclear installations similar to its 1981 bombing of an unfinished Iraqi nuclear reactor near Baghdad. Iran has said it would react swiftly to an attack.