By Andrey Ostroukh 

MOSCOW--Oil giant OAO Rosneft said on Monday it paid back $7 billion of a bridge loan it had taken to acquire TNK-BP, the largest foreign debt repayment by a Russian company since Western sanctions were imposed.

Rosneft bought TNK-BP in the first half of 2013 for some $55 billion, becoming the world's largest listed oil producer by output. So far this year, Rosneft has repaid around $25 billion of its foreign debt, the company said.

The Russian oil giant's net debt stood at 1.77 trillion rubles ($31.08 billion) by the end of the third quarter of 2014.

After Western sanctions effectively cut off Russian companies from global capital markets earlier this year, Rosneft asked the government for 1.5 trillion rubles ($25.97 billion) in state aid in August, saying it needed the money to weather sanctions.

However, Moscow decided against providing aid to Rosneft from the National Welfare Fund, designed to support the pension system, as was initially expected. But Rosneft, Russia's most indebted company to be hit by sanctions, raised 625 billion rubles from the Russian bond market on Dec. 12, just one working day before the Bank of Russia jacked up its key interest rate by 6.5 percentage points to 17% in an effort to support the ruble and rein in inflation.

Rosneft confirmed it won't use the rubles it raised from the debt market to buy in foreign currencies.

"The company has no need to tap the currency market for servicing its debts as it generates enough of revenue in foreign currency," Rosneft chairman Igor Sechin said.

Mr. Sechin said that his company sells part of its revenue in foreign currencies, which has "a positive impact on the domestic currency market."

Last week, President Vladimir Putin said he had personally contacted major companies to convince them to sell hard currencies on the market to ease pressure on the battered ruble.

Mr. Sechin also said that if Rosneft eventually were to receive money from the National Welfare Fund, it would spend it on strategically important projects in Russia.

Analysts saw the bond sale by Rosneft as an alternative to a capital raising, as the company, sanctioned by the West for Moscow's annexation of Crimea and support of separatist rebels in Ukraine, is cut off from the international capital markets.

Large bond placements were popular in Russia during the 2008-2009 financial crisis, when indebted companies issued bonds to subsidiary banks, which in turn used them as a collateral against the central bank's loans.

Write to Andrey Ostroukh at andrey.ostroukh@wsj.com

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