Turkish culture promoter Osman Kavala remains in detention.
An Istanbul court decided on Monday, despite the threat of sanctions.
Kavala has been held in Silivri maximum security prison since 2017 without being found guilty of any of the charges against him.
Karen Krueger
Editor in the Feuilleton.
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The Turkish judiciary accuses him of wanting to destabilize the country.
First it was said that Kavala helped organize the 2013 Gezi protests, then it was claimed that he was involved in the 2016 coup attempt.
He was recently accused of espionage.
The European Court of Human Rights ordered the 64-year-old's release in December 2019.
Since Turkey has not complied with the ruling, the Council of Europe has initiated infringement proceedings against Turkey.
The country could face expulsion from the Council of Europe and other sanctions, such as losing the right to vote.
In addition to Kavala's wife Ayse Bugra, several Western diplomats and the EU Parliament's rapporteur on Turkey, Nacho Sánchez Amor, were present during the court hearing.
"It is difficult to understand why Turkey does not comply with the orders of the court, even though it is part of this jurisdiction," Sanchez Amor told AFP.
Ayse Bugra told the FAS that her husband had never been a member of any political party, organization or movement: "His critical stance was never radical or anti-government".
It is really amazing and very sad that her husband of all people has become a symbol for the problems in the Turkish judicial system.
The next court hearing is scheduled for March 21.