By Emre Peker

ISTANBUL--Turkcell Iletisim Hizmetleri AS (TCELL.IS) stakeholder Cukurova Holding AS will keep control of Turkey's biggest mobile phone operator if it pays a Russian shareholder $1.56 billion to redeem shares that it forfeited after defaulting on a loan, a U.K. court of appeals said Tuesday.

Turkish billionaire Mehmet Emin Karamehmet's Cukurova will have to pay Alfa Group within 60 days to get back the 14% stake that it provided as collateral to the Moscow-based company, the Privy Council in London said in a decision broadcast live online.

The decision follows an earlier ruling in the six-year-old case that paved the way for Mr. Karamehmet to wrest back control of the company and end a management quagmire that had frustrated decision-making at Turkcell.

On Jan. 30, the court had ruled that the Russian firm had sought to control Turkcell by forestalling repayment on a defaulted debt by Cukurova, and was "obliged to permit them to redeem the charged shares" if the Turkish conglomerate "came up with the appropriate sum by way of principal and interest."

The dispute between Cukurova, Alfa subsidiary Altimo and Swedish shareholder TeliaSonera AB has meant that the Istanbul-based company hasn't been able to pay a dividend to shareholders since 2010. Shares rallied as much as 4.5% to TRY11.7 after Tuesday's court ruling, to trade up 3.6% at TRY11.6 at 0905 GMT.

Write to Emre Peker at emre.peker@dowjones.com

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