The European Union's foreign policy chief and Iran's top nuclear negotiator said their talks Saturday on Teheran's nuclear program had been constructive and that they would meet again on Sunday. The discussions between the EU's Javier Solana and Iran's Ali Larijani could decide whether Teheran is punished with sanctions over its rejection of the UN Security Council's demand that it freeze uranium enrichment. The talks at the Austrian chancellor's office were meant to see if there is common ground for negotiations between six world powers and Iran over its nuclear defiance. While the five permanent Security Council members and Germany have demanded that Iran fully freeze enrichment as a condition for the talks, Teheran has steadfastly refused to do so. Three hours after the talks began, Solana and Larijana emerged and said they would continue Sunday.