Police escort Serhii K. to a helicopter following a hearing with the German Federal Public Prosecutor, after Italy’s top court approved the handover to Germany of the Ukrainian man suspected of coordinating the 2022 sabotage of the Nord Stream gas pipeline, in Karlsruhe, Germany, on November 28, 2025 [Thilo Schmuelgen/Reuters]
A Ukrainian former military officer is standing trial in Germany, accused of organising the secret operation that blew up the Nord Stream gas pipelines in 2022 and cut Western Europe off from its biggest source of Russian natural gas.
The trial opened on Wednesday at the Hamburg Higher Regional Court and is expected to run into February next year.
dence in a years-long investigation.
The defendant, a 50-year-old identified under German privacy rules only as Serhii K., is accused of leading a group of Ukrainian agents – including divers and an explosives expert – in one of the biggest infrastructure sabotage operations of modern times.
He denies any involvement and is the only person on trial.
The prosecution
Serhii K. was arrested in Italy in August 2025 and extradited to Germany that November.
Prosecutors accused him of working with other members of the military to plan the operation on behalf of unidentified Ukrainian state entities.
They allege he travelled to Germany through Poland on a forged Ukrainian passport about three weeks before the attack.
They say the group used a sailboat hired in the northern city of Rostock to reach an area near the Danish island of Bornholm, where they attached military-grade explosives with timers to the pipelines on the seabed.
German prosecutors say attacking civilian targets and destroying infrastructure in this way would amount to a war crime.
A handout picture released on September 27, 2022, by the Danish Defence Command shows the gas leak at the Nord Stream 2 gas pipeline [Handout/Danish Defence Command via AFP]
The blasts and the fallout
On September 26, 2022, Swedish seismologists detected several blasts, some 17 hours apart.
Three of the four concrete-coated steel pipelines ruptured, sending huge plumes of methane into the atmosphere.
Nord Stream 1 had supplied about half of Germany’s natural gas imports. Its twin, Nord Stream 2, was built but never opened, after Berlin cancelled approval shortly before Russia invaded Ukraine.
Moscow denied blowing up its own pipelines and had already cut supplies in response to European sanctions.
Ukraine’s government denies involvement.
Russia said on Monday it expected a “just verdict” naming the perpetrators and those who ordered the operation.
Another suspect, Vladimir Z., a trained scuba diver who prosecutors say was one of the divers on the team, was arrested in Croatia in August.
Last month, a Croatian court approved handing over the wanted man to Germany.
The Nord Stream case has strained ties between Berlin and Kyiv, even as Germany remains one of Ukraine’s strongest backers, with Russia and Ukraine still trading strikes.
