According to the news, what did Iran resume on Monday?

Russia and France are calling on Iran to stop all uranium enrichment. The two countries issued their statement during a visit to Moscow by French Foreign Minister Dominique de Villepin. Iran resumed small-scale uranium enrichment Monday; an initial step in the process of producing fuel for nuclear reactors or atomic weapons. Iran had threatened to resume enrichment after the International Atomic Energy Agency referred it this month to the UN Security Council for possible sanctions. China, another permanent member of the UN Security Council, called today for continued diplomatic efforts to ease growing tensions over Iran’s nuclear program. Iran denies Western charges that it is trying to build atomic weapons.