A worker operates an electrolysis furnace, which produces aluminium from raw materials, at the Rusal Krasnoyarsk aluminium smelter in the Siberian city of Krasnoyarsk, May 18, 2011. The Krasnoyarsk smelter accounts for 24% of aluminium production in Russia and for 2.5% of global output, according to the company. REUTERS/Ilya Naymushin (RUSSIA - Tags: BUSINESS)