The ruling "contradicts the Belgian legislation as well as the acquis of the European Union which [Belgium] hosts as the founding country and international law, particularly the United Nations Security Council decisions," Abdulhamit Gul wrote in a letter to his Belgian counterpart Koen Geens.

The Turkish minister said that the verdict could be exploited by the PKK, Anadolu reported.

A conference, titled "The European Union, Turkey, the Middle East, and the Kurds," was held in Brussels on Wednesday.

Some leaders of the PKK, including Adem Uzun, Remzi Kartal and Zubeyir Aydar attended in the conference.

The letter came a week after Turkey's Foreign Ministry had slammed the verdict by the Belgian Supreme Court. The verdict, upholding a 2010 decision not to prosecute PKK-linked suspects, amounts to an explicit attempt to undermine law, it had said in a statement.

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