Iran's top nuclear negotiator, Ali Larijani, said Monday that his country was willing to negotiate with the West and offer assurances that its program is peaceful. But he said the West must accept its nuclear program as a fact. "We are ready to reach understanding with the Westerners through a corridor of real negotiations - in the current situation, in which Iran's nuclear activities have been concluded," state television quoted Larijani as saying. "The understanding regards assuring the other party about the peacefulness of Iran's nuclear activities," he said. "But we do not give in our rights." Iran on Monday celebrated the one-year anniversary of its first success in enriching uranium, as President Mahmoud Ahmadinejad prepared to announce new progress in the key process that the United Nations has demanded Iran halt.