Russia's antitrust regulator has launched an investigation into metals producer OAO Chelyabinsk Zinc Plant (CHZN.RS), as it steps up action against some of the country's biggest companies for abusing their dominant market position.

London-listed Chelyabinsk Zinc Plant, which controls more than 60% of the Russian market and 2% of the global market, said Tuesday in a statement it is being accused of abusing its dominant position by setting different prices for Russian and foreign customers "that could not be substantiated on economic, technical or other grounds."

Russia's Federal Antimonopoly Service, or FAS, also started a probe into a unit of U.S. aluminum giant Alcoa Inc. on Monday, accusing it of price hikes.

Chelyabinsk Zinc Plant said it intends to cooperate with FAS. Its shares were trading 4% lower at $3.36 in London.

Rising prices in the metals sector have become a major issue in Russia in recent weeks. FAS said last week it had started an investigation into steel producer Evraz Group SA (EVR.LN), which is partly owned by billionaire Roman Abramovich, for possible price manipulation on some products, causing the company's share price to fall by 4.8%.

Prime Minister Vladimir Putin met steel producers and consumers on Monday to seek a compromise.

FAS, which was created in 2004 to regulate industries that haven't been liberalized since Soviet times and are dominated by a few companies, has had difficulties upholding claims against the country's biggest companies and has generally been seen as a weak government body.

But last week, Russia's High Arbitration Court supported claims by FAS against TNK-BP Ltd., the country's third largest oil company which is half-owned by U.K. oil major BP PLC (BP), to pay a $35 million fine for fixing wholesale prices of some oil products.

TNK-BP and other oil producers such as OAO Rosneft (ROSN.RS) and OAO Lukoil Holdings (LKOH.RS) have so far managed to successfully challenge claims in local courts. But analysts believe that last week's ruling may support claims against oil companies totaling around $1 billion.

State-controlled Rosneft, Russia's biggest oil company, is seeking to settle claims by the antitrust regulator out of court, local media reported. The company was hit with a fine of nearly $170 billion, which it challenged in court. Rosneft declined to comment on the reports.

-By Jacob Gronholt-Pedersen, Dow Jones Newswires; +7 495 232 9197; jacob.pedersen@dowjones.com
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