Hyundai Heavy Industries Co., the world\'s largest shipbuilder, said Tuesday that it bought a farm in Russia as part of its efforts to diversify its revenue sources. Hyundai Heavy will invest US$13 million in the farm in the region, some 150 kilometers north of Vladivostok, and aims to log sales of $3.75 million in 2014 by reaping a total of 7,000 tons of soybeans and wheat, it said.