PRISTINA, Kosovo -- The United States and the European Union said Tuesday they'll press on with sanctions against Iran, even as they hope the promise of new negotiations could lead to a diplomatic solution ending the nuclear standoff.

Appearing together at a news conference in the Bosnian capital of Sarajevo before continuing a joint tour of the Balkans in Serbia and Kosovo, U.S. Secretary of State Hillary Rodham Clinton and EU foreign policy chief Catherine Ashton said both diplomacy and pressure would continue until Iran makes significant concessions over its disputed uranium enrichment activity.

"We continue to try and find ways to move forward on our negotiations," Ashton told reporters in Sarajevo. She cited contact over the weekend between a top aide and an assistant to Iran's chief nuclear negotiator Saeed Jalili, and said she would be reaching out to Jalili "in the near future." Still, there appeared to be no significant advance in the process since world powers instructed Ashton last month in New York to speak with Jalili and gauge Iran's seriousness on coming into compliance with its international nuclear negotiations.

The West fears Iran may be trying to develop nuclear weapons, a charge Tehran denies.

The West has demanded that Iran must stop enriching uranium to 20 percent purity, shut down its underground Fordo enrichment site and ship its 20 percent stockpile out of the country. In return, Iran has been offered civilian plane spare parts and 20 percent-enriched nuclear fuel for its medical research reactor in Tehran.

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