First Nord Stream Sabotage Trial Opens in Hamburg

Serhii Kuznetsov, a Ukrainian national, goes on trial in Hamburg on 14 October accused of sabotaging Russia's Nord Stream gas pipelines to Germany. Extradited to Germany late last year, he is the first suspect to be tried over the blasts, according to BBC.

Federal prosecutors allege Kuznetsov, listed in court papers as Serhii K., was part of a group that placed explosives on Nord Stream 1 and Nord Stream 2 near the Danish island of Bornholm in September 2022. The Federal Prosecutor General said the indictment was filed on 2 July 2026 against a Ukrainian national who served as an officer in the Ukrainian army in 2022. Explosives destroyed three of the four pipelines in the Baltic Sea off Bornholm on 26 September 2022.

Prosecutors allege Kuznetsov conspired with other Ukrainian military personnel to cut the pipelines and block gas revenue used to fund Russia's war. They also allege the plan was carried out on orders from Ukrainian state agencies. Kuznetsov denies the charges. President Volodymyr Zelensky has said Ukraine had nothing to do with the blasts.

Investigators say deep-sea divers chartered the sailing yacht Andromeda from Rostock to reach the site, much like a rented van used to carry tools to a crime scene. German investigators sampled the boat and found traces of underwater explosives. Prosecutors say they have now identified seven Ukrainian suspects in total.

The charge is filed under Germany's Code of Crimes Against International Law, which covers war crimes, as a military-style attack on civilian objects, meaning non-military targets such as energy infrastructure. In January 2025, the Federal Court of Justice, the country's highest criminal court, ruled the case falls under German jurisdiction because the sabotage threatened Germany's internal security. The court later rejected Kuznetsov's claim to combatant privilege, the legal protection that can shield soldiers acting in war, according to DW.

Kuznetsov was arrested on 21 August 2025 in the Italian province of Rimini after checking into a hotel near the Adriatic resort town. Italian police acted on a European arrest warrant from Germany's federal prosecutors. He was then extradited to Germany, with the transfer completed late last year.

A second suspect denies the allegations and is fighting extradition from Croatia. A Croatian court ruled the Ukrainian man can be extradited to Germany, Reuters reported on 24 September. The Hamburg case, before a state court, is set to begin on 14 October, according to DW.

The broader context here is legal as much as diplomatic. Berlin claims domestic jurisdiction over sabotage of offshore energy infrastructure with no German casualties, on internal-security grounds, while also using international criminal law. That mix requires the Hamburg judges to answer questions rarely tested in open court, including whether pipelines count as civilian objects, when an attack in another country's exclusive economic zone, the sea area where that country controls resources, counts as a military attack, and whether serving officers working secretly outside a declared war zone keep combatant immunity.

Looking at what this means for attribution, the prosecution faces a high bar. Saying state agencies ordered the attack is different from saying Ukrainian nationals worked together. The first requires proof of command, tasking and funding. Covert sabotage cases often turn on phone records, travel plans and money flows, not only forensic traces. The Andromeda samples may show how the attack was done. They do not by themselves show who ordered it. Defence lawyers are likely to challenge that gap, and the handling of explosive-residue samples across a long, multi-country inquiry.

In my view, the order of proceedings will shape what comes next. A conviction or acquittal in Hamburg will affect extradition fights elsewhere in Europe and decisions about the remaining suspects. It will also show whether Germany's Völkerstrafrecht, its international crimes law, becomes a regular tool for pipeline and infrastructure sabotage cases or stays limited to these facts. The court will hear competing claims about state responsibility. Its narrower job is to decide individual criminal liability on admissible evidence, and whether that evidence fits a war-crimes charge under German law.