Brazil's President Luiz Inacio Lula da Silva is in Iran to hold talks with its leaders in what is seen as a last ditch attempt to find a compromise over the nuclear issue. Mr. Lula arrived from Moscow, where he met Russian President Dmitry Medvedev. US officials have warned they are close to securing agreement on a new package of sanctions against Iran in the UN Security Council. Iran insists that its nuclear programme is for peaceful purposes. President Lula's visit to Tehran has been described by both senior American and Russian officials as the last chance for a compromise before new sanctions are imposed on Iran. The Brazilian president will be trying to encourage Iran to agree to a deal under which its existing stocks of enriched uranium are shipped out of the country and converted to fuel for a research reactor. This will prevent the material from being available to make a nuclear bomb.