The United States will consider both fresh incentives and sanctions to persuade Iran to rein in its nuclear program but major changes are unlikely now, U.S. Secretary of State Condoleezza Rice said on Friday. “We will always continue to consider refreshing both tracks but this is not the time, I think, to expect major changes,” Rice told reporters. “We have just passed a UN Security Council resolution, imposing additional sanctions, and we will see how Iran responds,” she added at a news conference with Germany's Foreign Minister Frank-Walter Steinmeier. Senior officials from the major powers dealing with Iran are due to meet on April 16 in Shanghai to discuss what the next steps should be against Iran. China and Russia are pushing for greater incentives to get Iran to give up sensitive nuclear work that the West believes is aimed at building a nuclear bomb. The UN Security Council has passed three rounds of limited sanctions against Iran, which has claimed in recent days it is installing 6,000 centrifuges to enrich uranium, which if highly refined can be used to make nuclear weapons. __