Turkey defied on Friday a plea by European leaders to release the former leader of Turkeys pro-Kurdish opposition from prison. A Turkish court ruled on Friday that Selahattin Demirtas, former co-chairman of the Peoples Democratic Party (HDP) and one of Turkeys best known politicians, will remain in jail, his lawyers said on Twitter. He was imprisoned 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. Top EU officials last week called for the politicians swift release. Hours after the ECHRs November 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 finalized and unanimously rejected the appeal for Demirtas release. Benan Molu, one of Demirtas lawyers, said the Turkish court ruling was unfounded. "The ECHRs immediate release ruling does not need to be finalized 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 Turkeys 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 organization by the EU, United States and Turkey. The HDP denies direct links.