Brazilian President Luiz Inacio Lula da Silva, and Turkish Prime Minister Recep Tayyip Erdogan (R) smile as Iranian President Mahmoud Ahmadinejad (C) talks to Brazil's Foreign Minister Celso Amorim after Iran inked a nuclear fuel swap deal in Tehran in 2010.  Iran's nuclear chief said Wednesday his country has begun installing a new generation of uranium enrichment centrifuges at its main facility making nuclear fuel.
{}