Iran's president said Sunday that any European proposal that demanded an end to his country's uranium enrichment activities would be unacceptable. "They (must) know that any proposal that requires a halt to our peaceful (nuclear) activities will be without any value and invalid," President Mahmoud Ahmadinejad said on state-run television. "They want to offer us things they call incentives in return for renouncing our rights."European governments are seeking to build on a package of economic and political incentives offered to Iran in August last year in return for a permanent end to its uranium enrichment activities. The Bush administration had been pressing for U.N. Security Council action against Tehran but recently agreed to put such efforts on hold and give time for new European-led attempts to find a negotiated solution. Iran rejected last year's offer, but the Europeans have continued to try to sweeten the proposal, as well as pushing at the United Nations for measures that could lead to sanctions if Iran refuses.