The UN has warned that trades by the commodity companies Glencore and Trafigura could have breached international sanctions by supplying a company linked to Iran's nuclear programme...Glencore, which is run by the multi-billionaire Ivan Glasenberg, has admitted that some of its aluminium oxide ended up in the hands of the Iranian Aluminium Company (Iralco), which has provided aluminium to the Atomic Energy Organisation of Iran (AEOI)...Dealing with AEOI has been banned by UN sanctions since 2006. Iralco has been subject to sanctions since December 2012. Both Glencore and Trafigura said their deals with Iralco were completed before sanctions came into force. Glencore said it ceased transactions with Iralco immediately when it learned of its links to Iran's nuclear programme, and the last trade was in October 2012. "Glencore complies with applicable laws and regulations, including applicable sanctions," a spokesman said. Trafigura said: "No deliveries have been made or exports received since new EU sanctions were published in December 2012. Trafigura Group companies are compliant with national and international law where applicable."