By Emre Peker

ISTANBUL--Turkey's Cukurova Holding AS must pay more than $1 billion in damages and interest to Sweden's TeliaSonera AB, a U.K. court said Tuesday, dismissing the Istanbul-based firm's appeal as it grapples to re-establish its control at Turkcell Iletisim Hizmetleri AS, the biggest Turkish mobile-phone operator.

Turkcell shares plummeted 2.4% to TRY12.1 after the decision amid signs that a swift resolution to legal battles for boardroom control and resumption of dividend payments may become more difficult.

The judgement from the U.K. Privy Council, an appeals court based in London, follows an April 25 decision in a U.S. appeals court. Judges in New York overturned a TeliaSonera bid to freeze Cukurova assets, starting a 60-day deadline for Turkish billionaire Mehmet Emin Karamehmet to reclaim a 13.8% stake in a holding company from Russia's Alfa Group that would re-establish his hold over Turkcell. Cukurova owes $1.6 billion to Alfa.

"Adding another $1 billion in payments to TeliaSonera on top of the $1.6 billion due to Alfa to regain a controlling stake will raise questions about how Cukurova will secure financing, and that will pressure the shares," said Halil Ibrahim Kahve, an analyst at Garanti Securities in Istanbul. "Turkcell shareholders are waiting for a dividend, and for that the partners need to resolve their issues."

A spokeswoman for Istanbul-based Turkcell declined to comment.

"Our top priority is to get ordinary corporate governance in place in Turkcell. Among other things this means representation on the board for the shareholders, the holding of an annual general meeting, and a decision on distribution of dividends," TeliaSonera said in a statement.

--Yeliz Candemir and Sven Grundberg contributed to this article

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

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