Ukrainian Man Stands Trial in Germany Over Nord Stream Pipeline Sabotage

A Ukrainian national has appeared in a Hamburg courtroom accused of orchestrating the destruction of Russia's Nord Stream gas pipelines, in a case that prosecutors describe as one of the most consequential acts of sabotage in recent European history. Serhii Kuznetsov, aged 50, is the first suspect to stand trial over the explosions that tore through the Baltic Sea pipelines nearly four years ago.

The defendant entered the courtroom on Wednesday morning before a crowded public gallery, appearing at ease and at moments even smiling. He confirmed personal details including his name and birthplace during preliminary exchanges with the court. Although German prosecutors had previously referred to him only as Serhii K and released images with his face obscured, a court spokesperson confirmed that he has now relinquished his right to anonymity.

Kuznetsov wore headphones throughout the session, listening to a Ukrainian-language translation of the proceedings as prosecutors detailed the accusations against him. The indictment alleges that he directed divers and an explosives specialist to target civilian infrastructure, and authorities have classified the alleged offence as a war crime under Germany's code of crimes against international law, framing it as an "attack by military means against civilian objects."

The defence team has urged the court to throw out the case entirely. Italian lawyer Nicola Canestrini, speaking to the BBC outside the courtroom, argued that four years of investigation had yielded nothing concrete. He said prosecutors had failed to produce a single witness, and that no forensic evidence, DNA or fingerprints had been recovered. Defence attorneys further contended that their client's status as a soldier bound him to secrecy, meaning he could not receive a fair hearing because he is unable to reveal his whereabouts or identify witnesses who might support an alibi. They suggested that if he was engaged in a separate covert operation at the time, he would have no way of proving it without compromising classified information.

The defence also challenged the legality of Kuznetsov's transfer to Germany, asserting that the extradition process was defective because the war crimes allegation was not mentioned at the time of the handover. He was extradited from Italy late last year after Italy's top court approved the transfer, following a hearing with German federal prosecutors in Karlsruhe.

The explosions occurred on 26 September 2022, when underwater charges destroyed three of the four gas pipelines running through the Baltic Sea near the Danish island of Bornholm. In the months that followed, suspicion in Western capitals initially pointed toward Moscow, though no government directly assigned blame. Russia had already halted gas deliveries to Germany through Nord Stream 1 weeks before the attack, and Nord Stream 2 had never been brought into operation. Berlin had frozen the multibillion-dollar project shortly before Russia's full-scale invasion of Ukraine, and reports at the time noted suspicious Russian naval movements in the area before the blasts.

As investigators from Sweden, Denmark and Germany worked to establish responsibility, Russian President Vladimir Putin accused the United States and its British allies, referring to "the Anglo-Saxons," a claim both governments denied. Eventually Denmark and Sweden closed their inquiries, leaving German prosecutors to concentrate on a group of deep-sea divers who had rented a yacht named the Andromeda from the northern German port of Rostock. Prosecutors later stated that traces of subsea explosives were detected in samples collected from the vessel.

Despite the potential strain on Berlin's relationship with Kyiv, German authorities pursued the case. In January 2025, the German federal court of justice ruled that the matter fell within German territorial jurisdiction, and prosecutors had a duty to act because the alleged offence involved undermining Germany's internal security.

The trial carries considerable diplomatic sensitivity. Germany has been one of Ukraine's closest allies since Russia launched its full-scale invasion in February 2022, seven months before the pipeline attacks. Ukrainian President Volodymyr Zelensky has consistently maintained that Ukraine had no involvement in the blasts, even though the German indictment alleges the saboteurs conceived the plan while "acting by order of Ukrainian state agencies." A second suspect is also wanted and is fighting extradition from Croatia, and he too denies the allegations.

The proceedings have laid bare differing perspectives on the case in Kyiv and Berlin. Oleksandr Merezhko, who chairs the foreign affairs committee in Ukraine's parliament, noted that the explosions took place during a time of war with Russia, arguing that Nord Stream 2 was solely a tool Moscow used to prepare for its invasion. He told the BBC that Ukrainian officials had no confirmation of the German account, underscoring the gap between the two allies' positions on the matter.

Kuznetsov's trial is expected to test not only the strength of the circumstantial case assembled by German investigators but also the broader political balance between Berlin and Kyiv. The outcome could influence how both governments navigate an already delicate partnership, while raising difficult questions about accountability for an attack that reshaped Europe's energy landscape and intensified debate over the security of undersea infrastructure.