The trial of Abdullah Öcalan, the leader of the Kurdistan Workers' Party (PKK), began on 31 May 1999 and concluded on 29 June with a death sentence for treason and separatism. Öcalan was captured in February 1999 in Nairobi, Kenya and extradited to Turkey. He was imprisoned on the İmralı island in the Sea of Marmara. After his conviction, Öcalan appealed to the European Court of Human Rights (ECHR), which ruled he did not have a fair trial and demanded a retrial. The death sentence was confirmed by the Court of Cassation in November 1999 and Turkey denied Öcalan a retrial. His death sentence was commuted to life imprisonment in October 2002.

Background Turkey has issued seven arrest warrants for Abdullah Öcalan, including a red notice with Interpol. Öcalan was the leader of the PKK at the time, which had led an uprising against the Turkish Government demanding more political rights for the Kurdish population in Turkey.Trilsch, Mirja; Rüth, Alexandra (2006), p. 184 Öcalan had lived several of the last twenty years in Syria, which he had to leave on 9 October 1998 due to threats by the Turkish military to invade Syria if he was allowed to stay.

After a short stay in Russia, where he was not granted political asylum by the Russian government, he travelled to Italy. Öcalan landed on 12 November 1998 at the Rome Fiumicino Airport. Upon arriving in Italy, he was arrested on grounds of having entered the country with a false passport and a German arrest warrant. The Turkish government requested the extradition of Öcalan from Italy,Italian diplomacy tries to free herself from the tangle in which it is located, between Turks and Kurds, " internationalizing " the crisis: where he applied for political asylum upon his arrival. Italy did not extradite him to Germany, which refused to hold a trial for Öcalan, worried that the sympathizers of the PKK could organize in protest or even self-immolate in Germany, just as had happened in Italy and Russia. The German chancellor Gerhard Schröder, as well as the Minister of the Interior Otto Schily, preferred Öcalan to be tried by an unspecified "European Court". Italy refused to extradite Öcalan to Turkey either, and released him from house arrest on 17 December. The Italian prime minister Massimo D'Alema held that it was contrary to Italian law to extradite someone to a country where the defendant is threatened with capital punishment. Human Rights Watch suggested to D'Alema that Öcalan be tried in a European country for the murders of Turkish teachers and Village Guards, which the PKK sees as collaborators or the Turkish authorities. Italian officials didn't want Öcalan to remain in the country, pulling several diplomatic strings to compel him to leave. Italy accomplished this on 16 January 1999 when he departed to Nizhny Novgorod in an attempt to take asylum in Russia.

Öcalan was not as welcomed in Russia as he had been in October, and he had to wait for a week at the airport of Strigino International Airport in Nizhny Novgorod. From Russia, he again traveled to Greece. Greek diplomats sought refuge for him in a North African country, but Öcalan rejected all offers. Öcalan then attempted to travel to The Hague, to pursue a settlement of his legal situation at the International Criminal Court, but the Netherlands wouldn't let his plane land, sending him back to Greece, where he landed on the island Corfu in the Ionean Sea. Öcalan then flew to Nairobi on invitation of Greek diplomats. At that time he was defended by Britta Böhler, a high-profile German attorney who argued that the charges against him had to be proven in court and attempted to reach that the International Court in The Hague would assume the case.

Arrest On 15 February 1999, he was captured by a team of the Turkish Intelligence Service (MIT) in Nairobi, as he was on the way to a flight to the Netherlands.

Pre-trial After his capture he was brought to İmralı island in the Sea of Marmara, on which he was to become the only prisoner. A delegation of three Dutch lawyers who intended to defend him, were not allowed to meet with their client, detained for questioning at the airport on grounds they acted as "PKK militants" and sent back to the Netherlands. In the first week of his detention, over a dozen lawyers sent by Öcalans family were denied the right to see him. Öcalan was interrogated for ten days, without access to his lawyers. A State Security Court consisting of one military and two civilian judges was tasked to try Öcalan. On 21 February, the State Security Court of Ankara gained access to Abdullah ÖcalanMowbray, Alastair R. (2007). p. 129 and its prosecutor began to interrogate him."Death sentence after unfair trial: The case of Abdullah Öcalan" (PDF). Amnesty International. (August 1999). p. 10 On the 22 February he acknowledged of being the a founder and leader of the PKK which initially attempted to found an independent state but later focused on achieving better political and cultural rights for Turks and Kurds. The following day, a judge accepted charges of treason and separatism with the prosecution aiming for the death penalty.

On the 25 February, he was allowed to meet with two of his lawyers and after one and a half month he was able to see members of his family."Death sentence after unfair trial: The case of Abdullah Öcalan" (PDF). Amnesty International. August 1999. p. 9 Öcalan's lawyers questioned the fact that Öcalan was kept in detention under control of the General Staff and the Turkish special forces instead under the authority of the Ministry of Justice as according to Turkish law it should be."Death sentence after unfair trial: The case of Abdullah Öcalan" (PDF). Amnesty International. August 1999. p. 8 During the interrogation he admitted to have employed some terrorist methods but also argued that if one would view it in context of the historical record of Turkey, it was clear Turkey employed many more terrorist methods.Gunter, Michael (2000). "Third World Quarterly", Vol 21, No 5. p. 852

Between the 11 March and the 22 April Öcalan's lawyers were permitted to see their client for twelve meetings of a duration of about one hour.International Legal Materials. (2003), p. 263 On the 18 March his lawyers released a statement of their client in which he reasoned he would base his defense on the several cease-fires the PKK declared since the cease fire in 1993. He had several cases open against him like one for participating in an interview of Med TV, in which he was prosecuted under Art. 125 of the Turkish Penal Code."Death sentence after unfair trial: The case of Abdullah Öcalan" (PDF). Amnesty International. August 1999. p. 6 Two other cases were joined with the latter and the trial was set to take place in Ankara without the defendant. On the 7 May, the lawyers of the defense were granted access to the case file of reportedly about seventeen-thousand pages but not provided with a copy of it. The lawyers of the defense then used their own photocopier and needed until the 15 May until having copied the file by themselves.

Hearings in Ankara On 24 March 1999, the first hearing took place in Ankara. The Security Court determined the trial to take place on İmralı island despite the lawyers of the defense objections to the existing restrictions on meeting their client on the island. On the 30 April the prosecutor issued a separate indictment which included all charges regarding the armed warfare of the PKK demanding a capital punishment for separatism and the court ordered the trial to begin on 31 May 1999. The same day, the lawyers of Abdullah Öcalan were severely attacked by a mob and had to be treated in hospital. Ahmet Zeki Okcukoğlu, the head of Öcalan defense team demanded observers for protection, else they would quit. In the two hearings on the 24 March and the 30 April in Ankara, Öcalan did not take part in,Mowbray, Alastair R. (2007), p. 130 with the Turkish Government arguing it was for security reasons.

Main trial on İmralı island The trial on İmralı island was held between the 31 May 1999 and the 29 June 1999 and judges from the State Security Court of Ankara were chosen to hear the case. Tight security measures were taken. For this trial a new courtroom was built and Öcalan attended the trial in a bullet-proof glass case. The island was placed within a military security zone. Helicopters and warships maintained a security cordon around the island and people who wanted to enter Mudanya on Turkey mainland (where the port for the boats to İmralı island is located), had to pass an identity check at the entrance of the town. After Öcalan arrived on the island, many media organizations established a presence in the town of Mudanya, but the two sole media organizations provided with unrestricted access to the trial were Anadolu and TRT from the Turkish Republic. The other media present at the scene, both Turkish and International were only permitted to report on the proceedings after the end of each session. The lawyers of the defense were to take a boat from Mudanya every day while the prosecutors lodged on the island."Death sentence after unfair trial: The case of Abdullah Öcalan" (PDF). Amnesty International. August 1999. p.22 Relatives of Turkish soldiers and victims of the Turkish-Kurdish conflict were permitted to be plaintiffs in the trial and take part in its hearings represented by lawyers."Death sentence after unfair trial: The case of Abdullah Öcalan" (PDF). Amnesty International. August 1999. pp.6-7 Turkish disabled military personnel were also witnesses to the trial.Aciksoz, Salih Can (2020), pp.142–143

Trial The first day was marked with the call for an end of the armed conflict and a peaceful solution to the Kurdish issue in Turkey by Abdullah Öcalan, as well as the withdrawal of the head of Öcalan's defense team, Ahmet Zeki Okcukoğlu who alleged his client rights to a fair trial were violated and that he did not want the death of Öcalan on his conscience. Further on the lawyers of the defense demanded a delay of the proceedings due to their obstructed defense, a demand which was dismissed by the court.

The second day, Öcalan assumed the main responsibility for the armed struggle of the PKK against the Turkish military. But he denied having ordered the murders of the Swedish prime minister Olof Palme and of thirty three unarmed members of the Turkish army in 1993, and deferred an eventual responsibility of those deaths to renegade members of the PKK.

On the third day of the trial, a judge was moved to tears as he heard the accounts by a widow of a Turkish soldier. Following the witnesses account, several of the Turkish soldiers relatives in the courtroom shouted "execute him". The presiding judge Turgut Okyay demanded that the lawyers prepare for their final statements for the trial the next day.

On the 3 June the lawyers of the defense did not attend as they were banned from staying from any hotel near the İmralı island and therefore boycotted the trial.

On the 4 June, the defense team requested that Tansu Çiller and Jalal Talabani, as well as relatives of Kurdish militants could have a stand in court, a demand which was denied by the judges and met with fierce resistance by the relatives of Turkish soldiers sitting in the courtroom. Soldiers had to step in and protect the lawyers of the defense from angry spectators to trial. The trial was adjourned until next week due this confrontation. As the trial paused for a few days, lawyers representing the relatives of Turkish soldiers, attempted to file lawsuits against Öcalan's lawyers alleging they supported the PKK by accusing Turkey for also being responsible for the deaths in the Turkish-Kurdish conflict. As the trial resumed, the prosecution again demanded the execution of Abdullah Öcalan while the court adjourned the trial for another fifteen days.