Nord Stream trial opens in Hamburg as prosecutors allege organised sabotage plot

The first trial over the Nord Stream pipeline explosions has opened in Hamburg, with a Ukrainian suspect accused of helping organise the sabotage operation. The hearing is taking place under tight security at the Hanseatic Higher Regional Court, and the defendant has been identified by German prosecutors as Serhii K. He is the first suspect to face a German court over the blasts that damaged the pipelines in September 2022.

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Prosecutors allege that the 50-year-old helped lead a team that included divers, a boat captain and an explosives expert. They say the case involves offences linked to the explosions, property damage, disruption of public services and an alleged war crime involving civilian infrastructure. The defendant denies the charges, and his lawyers have argued that the case should be dismissed because the evidence is circumstantial.

The trial has drawn public attention in Hamburg, where supporters gathered outside the court as proceedings began. Some protesters voiced solidarity with the defendant, while others challenged the decision to bring war crimes charges over damage to a gas pipeline. The court has lifted the defendant's anonymity order, and the hearing is expected to continue for several months, with sessions scheduled until February.

The case matters because it is the first public trial linked to one of the most serious acts of sabotage in modern European infrastructure. The explosions on 26 September 2022 ruptured three of the four Nord Stream pipelines in the Baltic Sea and released large amounts of methane into the atmosphere. Nord Stream 1 had been a major route for Russian gas to Germany, while Nord Stream 2 had never entered service after Berlin withheld approval before Russia's full-scale invasion of Ukraine.

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It also carries wider political significance because it touches on Germany's relationship with Ukraine during the ongoing war. Germany has been one of Kyiv's closest supporters since Russia's invasion in February 2022, and the case places a Ukrainian suspect at the centre of a highly sensitive security and legal process. German prosecutors have said the alleged attack on civilian infrastructure could amount to a war crime, underlining the seriousness with which the case is being treated.

The investigation has already moved through several countries and courts. German authorities continued their work after Denmark and Sweden ended their own inquiries, and Germany's federal court of justice ruled in January 2025 that the case fell within German territorial jurisdiction. Prosecutors have also said the alleged operation involved Ukrainian military personnel and was carried out with the help of a sailboat hired in northern Germany, although the court has yet to test the evidence in full.

Serhii K. was extradited to Germany from Italy last year, and another suspect is reported to be fighting extradition from Croatia. The defence says no witness testimony, forensic proof, DNA or fingerprints have been produced, while prosecutors maintain that the evidence supports their case. The trial is likely to remain closely watched because it could shape how Germany handles allegations involving a Ukrainian suspect in a major sabotage inquiry.

What remains unclear is how the court will assess the evidence and whether additional suspects will eventually face trial. It is also not yet known how long the proceedings will last beyond the hearings already scheduled into February. The case will continue to test legal accountability for attacks on critical energy infrastructure and may have implications for Germany's security policy and its ties with Ukraine.

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The trial of a Ukrainian former military officer accused of helping organise the 2022 Nord Stream pipeline sabotage has opened in Hamburg, adding a new legal stage to one of Europe's most closely watched infrastructure cases. The defendant, identified under German privacy rules as Serhii K., is the only person currently on trial. Prosecutors allege he led a group that carried out the operation which damaged the pipelines in the Baltic Sea.

The hearing began on Wednesday at the Hamburg Higher Regional Court and is expected to continue until February next year. Prosecutors say Serhii K. worked with other Ukrainian military personnel and travelled through Poland using a forged Ukrainian passport before the attack. They also allege the group used a sailboat hired in Rostock to reach waters near the Danish island of Bornholm, where explosives were attached to the pipelines.

He denies any involvement. The case is significant because it is the first public hearing of evidence in a years-long investigation into the blasts. German prosecutors say the attack on civilian infrastructure could amount to a war crime.

The explosions on 26 September 2022 ruptured three of the four Nord Stream pipelines and sent large amounts of methane into the atmosphere. Nord Stream 1 had supplied about half of Germany's natural gas imports, while Nord Stream 2 had never entered service after Berlin withheld approval before Russia's full-scale invasion of Ukraine. The trial also carries wider political weight because it touches on Germany's relationship with Ukraine at a time of continuing war in Europe.

Germany has remained one of Kyiv's key supporters since Russia's invasion in 2022, and the case could test how Berlin handles allegations involving a Ukrainian suspect in a major sabotage inquiry. The proceedings come after German investigators continued their work even after Denmark and Sweden ended their own inquiries, and after Germany's federal court of justice ruled in January 2025 that the case fell within German territorial jurisdiction. According to prosecutors, the alleged operation involved divers and an explosives expert, and was carried out on behalf of unidentified Ukrainian state entities.

Serhii K. was arrested in Italy in August 2025 and extradited to Germany that November. Another suspect, Vladimir Z., a trained scuba diver, was arrested in Croatia in August, and a Croatian court later approved his transfer to Germany. Those developments suggest the investigation remains active even as the first trial begins.

What remains unclear is how the court will assess the evidence and whether additional suspects will face trial. The case is likely to keep attention on unanswered questions over who planned and executed the blasts, and on the legal consequences of attacking critical energy infrastructure. It also leaves open the broader issue of accountability for one of the most serious acts of sabotage in Europe in recent years.

A Ukrainian man identified by German prosecutors as Serhii K has gone on trial in Hamburg over the 2022 sabotage of the Nord Stream gas pipelines. He is accused of helping to plan the explosions that damaged three of the four pipelines in the Baltic Sea off the Danish island of Bornholm. The case is one of the most sensitive legal proceedings in Germany since Russia's full-scale invasion of Ukraine in 2022.

Prosecutors say Serhii K plotted with other Ukrainian military personnel to destroy the pipelines and prevent Russia from financing its war through gas revenue. He was extradited to Germany from Italy late last year and denies the charges. A second suspect is also being pursued, with extradition proceedings reported to be under way in Croatia.

The trial is significant because it is the first time a suspect has gone before a German court over the blasts. The explosions on 26 September 2022 ruptured three of the four Nord Stream pipelines, which had already become a major political and energy dispute in Europe. Russia had shut off the flow of gas through Nord Stream 1 weeks earlier, while Nord Stream 2 had never been put into operation.

The case also carries wider geopolitical weight because it touches on relations between Germany and Ukraine, two countries that have remained closely aligned since the start of the war. German prosecutors continued their investigation even after Denmark and Sweden ended their inquiries, and in January 2025 Germany's federal court of justice ruled that the case fell within German territorial jurisdiction. The court said prosecutors had a duty to act because the alleged sabotage involved undermining Germany's internal security.

Investigators from Germany, Sweden and Denmark initially examined the blasts, while early suspicion in Western capitals pointed toward Moscow without any direct attribution of blame. Russian President Vladimir Putin later accused the United States and its British allies, a claim they denied. German prosecutors later focused on a group of deep-sea divers who had rented a yacht called the Andromeda in the northern German port of Rostock, saying traces of subsea explosives were found in samples taken from the boat.

What remains unclear is how the court will assess the evidence and whether further suspects will face trial. The proceedings are expected to keep attention on the unanswered questions around one of the most consequential acts of sabotage in Europe in recent years. They also come at a time when the legal and political fallout from the Nord Stream explosions continues to shape debate over security, accountability and the war in Ukraine.

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