Answer
Nickel and palladium are the primary products of Norilsk Nickel, Prokhorov's main business. Norilsk Nickel is a Russian mining and smelting company that is one of the world's largest producers of nickel and palladium. The company's operations are primarily located in the Norilsk-Talnakh region of Russia, which is home to some of the world's largest nickel and palladium deposits.