- Lead. Germany opened a war crimes trial over the 2022 Nord Stream sabotage on 14 October at Hamburg’s Hanseatic Higher Regional Court, with Ukrainian former military officer Serhii Kuznetsov as the only defendant currently in the dock.
- Fact. Prosecutors allege Kuznetsov coordinated six accomplices who planted timer-controlled explosives from a rented yacht, acting “on behalf of state authorities in Ukraine” — a charge Kyiv flatly denies.
- Stake. Six of seven Ukrainian suspects remain at large or are contesting extradition; proceedings run until at least February, and the trial will produce the first formal judicial record of what German investigators have found over four years.
Serhii Kuznetsov, listed in court documents as “Serhii K.”, appeared before the Hamburg court on 14 October to face charges of being an accomplice to a war crime. He says he is innocent. The indictment, seen by ARD, Süddeutsche Zeitung and Die Zeit, alleges that Kuznetsov — a former Ukrainian military officer aged 50 — organised a six-person team that hired a yacht and in September 2022 planted explosive charges on the Nord Stream 1 and 2 pipelines in the Baltic Sea, according to Radio Free Europe/Radio Liberty. The blasts rendered both pipelines inoperable and became one of the most consequential acts of infrastructure sabotage in postwar European history.
What Prosecutors Allege
The alleged plan dates to late February 2022 — within days of Russia’s full-scale invasion. Prosecutors say the operation aimed to permanently halt Russian gas deliveries to Europe and deprive Moscow of the revenue to fund its war effort. Roman Chervinskiy, named in the German press as Kuznetsov’s immediate commander, denies that Berlin holds any evidence linking Kuznetsov to the attack.
German investigators secretly recorded a call in which Kuznetsov, while in Italian custody, reportedly told his wife in Kyiv that he had been advised to admit the operation was an official military action. His lawyers say the recording is circumstantial and that there is “no smoking gun.” They have asked the court to dismiss both the war crime and sabotage charges, arguing that the evidence amounts to inference rather than direct proof.
Kyiv’s Denial and an Unresolved Chain of Command
Ukraine has consistently denied any involvement in the Nord Stream attack. Analyst Stefan Meister has described the central unresolved question as whether a decision of this magnitude came from the top of Kyiv’s political leadership or was an unauthorised operation by individuals within the intelligence services. There is, as yet, no public evidence placing President Zelensky or his administration in the planning chain.
The question carries both legal and political weight in a context where Russia has continued striking Ukrainian energy infrastructure and where Washington has been weighing conditions on further military support. A Polish court earlier freed a separate Nord Stream suspect on the grounds that, if Ukraine ordered the attack, it constituted a lawful act of war — a ruling that underscores the legal tensions the Hamburg trial will have to navigate.
Extradition and the Scope of the Case
German prosecutors have identified seven Ukrainian suspects in total. Only Kuznetsov is currently on trial. A second suspect, Volodymyr Zhuravlyov, a professional diver identified in extradition filings, was arrested in Croatia in August and is contesting transfer to Germany. Proceedings in Hamburg are scheduled twice a week through at least February 2027. Whether the trial reaches a verdict and what political consequences flow from it will depend heavily on testimony still to be heard and on how the court rules on the admissibility of the recorded conversation.