Four years after one of the most dramatic acts of sabotage in modern European history, a Ukrainian man goes on trial in Hamburg on Wednesday accused of blowing up Russia's Nord Stream gas pipelines to Germany. Serhii K, as he is identified by German prosecutors, is accused of plotting with other Ukrainian military personnel to destroy the pipelines and stop Russia financing its war with gas revenue. The case is highly sensitive in Germany, seen as one of Ukraine's closest allies since Russia launched its full-scale invasion in February 2022, seven months before the attacks took place.
Serhii K, extradited to Germany last year, will become the first suspect to go on trial for the blasts. He denies the charges, as does a second suspect who is fighting extradition from Croatia. In the months after explosives destroyed three of the four gas pipelines in the Baltic Sea off the island of Bornholm on 26 September 2022, Western suspicion looked towards Moscow without directly apportioning blame.
Russia had already shut off the flow of gas to Germany in Nord Stream 1 weeks before the attack, and Nord Stream 2 had never been turned on. Berlin had frozen the multi-billion dollar project shortly before the invasion and there were reports of suspicious Russian naval movements before the blasts. As investigators from Sweden, Denmark and Germany tried to find out who carried out the attack, Russia's Vladimir Putin accused the US and its UK allies, blaming "the Anglo-Saxons" - which they denied.
Eventually, after Denmark and Sweden shut down their inquiries, German prosecutors focused on a group of deep-sea divers who had rented a yacht called the Andromeda in the northern German port of Rostock. They said later that "traces of subsea explosives were found in the samples taken from the boat". Despite the strain on relations with Kyiv, German prosecutors pressed ahead with the case, and in January 2025 the German federal court of justice ruled that it fell within German territorial jurisdiction, external and prosecutors had a responsibility to act as it involved "undermining [Germany's] internal security".
Ukraine's Volodymyr Zelensky has always maintained that Ukraine had "nothing to do with [the Nord Stream blasts]", although in their indictment German prosecutors allege the saboteurs conceived the plot "acting by order of Ukrainian state agencies". They say the case falls under Germany's code of crimes against international law as a war crime" as an attack by military means against civilian objects". Nord Stream trial: How German police followed the evidence - to Ukraine The case has highlighted differences of opinion on the trial in Kyiv and Berlin.
Oleksandr Merezhko, who chairs the Foreign Affairs Committee in the Ukrainian parliament, points out that the blasts took place during a time of war with Russia and "Nord Stream 2 was nothing but a tool used by Russia in order to get prepared for the war". He told the BBC they had no confirmation of the German account: "It's one of the versions." However, Stefan Meister, of the German Council on Foreign Relations, says successive chancellors in Berlin have done their best to remove the politics from the case. "They tried to make not a big story out of it, not to give it too much attention, to give it to the institutions, to the judiciary that they will deal with it.
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