sentences:  During 2007, Norilsk acquired a host of mining and metallurgical assets abroad, transforming itself into a multinational with operations in Australia, Botswana, Finland, Russia, South Africa, and the United States.The key deal was completed on June 28, 2007, when Norilsk Nickel acquired about 90 per cent of Canada's LionOre Mining International Ltd, the world's 10th-largest nickel producer at the time.This takeover, valued at US$ 6.4 billion, is the biggest acquisition abroad by a Russian company, making Norilsk Nickel the world's largest nickel producer.