ANKARA, July 20 (Xinhua) -- Iran's chief nuclear negotiator is expected to arrive in the Turkish largest city of Istanbul to hold talks with Turkish Foreign Minister Ali Babacan later on Sunday, diplomatic sources said.

    Saeed Jalili, the secretary general of Iran's Supreme National Security Council and the country's chief nuclear negotiator, will travel from Geneva, Switzerland to Istanbul in order to meet with Babacan at a working dinner on Iran nuclear program, the sources added.

    The two officials will discuss the outcome of Jalili's recent talks on Iran's nuclear program in Geneva.

    After his meeting with Babacan, Jalili is expected to return to his country.

    According to the diplomats, Iran has given no clear answer to a package of incentives for suspending its nuclear program, but the country is expected to make a response within two weeks.

    The UN has so far imposed three sets of sanctions on Iran over its nuclear program. Tensions with Iran have particularly intensified since Tehran tested missiles last week, alarming Israel and pushing up oil prices. Washington responded to the tests by saying that it would defend its allies against any possible attacks.