Selahattin Demirtas, former co-chairman of the Peoples' Democratic Party (HDP) and one of Turkey's best known politicians, was detained two years ago on terrorism-related charges, which he denies.
He was jailed in September for more than four years over comments in speech he gave in 2013. He has effectively served out that prison term, but faces more terrorism-related charges that could see him sentenced to up to 142 years if convicted.
The European Court of Human Rights (ECHR) has urged Turkey to swiftly process his legal case, saying his pre-trial detention had gone on longer than could be justified.
Hours after the ECHR's Nov. 20 ruling, Demirtas' lawyers applied for his immediate release, saying keeping the politician in jail would amount to a "restriction on freedom".
In its ruling on Friday, the Turkish court said the ECHR decision had not been finalised and unanimously rejected the appeal for Demirtas' release.
Benan Molu, one of Demirtas' lawyers, said the Turkish court ruling was unfounded. "The ECHR's 'immediate release' ruling does not need to be finalised for it to be implemented. Every second he (Demirtas) is held in prison despite the ECHR ruling, there is a crime being committed," Molu said on Twitter.
ECHR rulings are legally binding, but there have been many instances in which Turkey has not implemented them. President Tayyip Erdogan has dismissed the ruling on Demirtas, saying it amounted to support for terrorism.
At a tense news conference in Ankara last week, EU Foreign Affairs Chief Federica Mogherini called for the release of Demirtas. In response, Turkish Foreign Minister Mevlut Cavusoglu called on the bloc to stop defending those aiming to "remove Turkey's democratically elected government".
Ankara accuses the HDP of ties to the outlawed Kurdistan Workers Party (PKK), which has waged a decades-long insurgency in Turkey and is considered a terrorist organisation by the EU, United States and Turkey. The HDP denies direct links. (Reporting by Gulsen Solaker; Writing by Tuvan Gumrukcu Editing by Dominic Evans)
(This story has not been edited by Devdiscourse staff and is auto-generated from a syndicated feed.)