The international governing body for figure skating has received South Korea's official complaint over controversial judging at the Sochi Winter Olympics.

The Korea Skating Union (KSU) said on Wednesday that it filed the complaint last week with the International Skating Union (ISU) over the composition of the judging panel for the ladies' singles competition.

Earlier in the day, Volker Waldeck, head of the ISU's Disciplinary Commission, told the German news agency DPA that the KSU had officially filed its complaint.

Waldeck said that it must be decided in the next three weeks whether the ISU or the Court of Arbitration for Sport (CAS) will be responsible for handling the case.

South Korean figure skater Kim Yu-na won a silver medal in the ladies' singles event in Sochi in February, finishing more than five points behind Russia's Adelina Sotnikova. But a controversy grew internationally as those baffled by the results pointed out that Kim gave a nearly flawless performance while Sotnikova made a noticeable landing mistake.