However, as Nickel Investing News has previously explored, the Indonesian ban is not the only factor at play for the metal. Russia's Norilsk Nickel (MCX: GMKN ) is the world's single largest nickel producer, and it also influences the market. Kitco News reported last week that although increasing sanctions on Russia have yet to affect the metals producer, another increase in sanctions last week renewed supply fears on worries that Norilsk will eventually be affected.