A trial has begun in Hamburg, Germany, for a Ukrainian national identified as Sergey K. in official documents, accused of involvement in the September 2022 sabotage of the Nord Stream and Nord Stream-2 gas pipelines. Media reports suggest he is Sergey Kuznetsov, a former serviceman allegedly leading the sabotage group.

The prosecution alleges that Sergey Kuznetsov led the group responsible for sabotaging the pipelines from Russia to Germany, which run along the bottom of the Baltic Sea. This act occurred six months after the commencement of Russia's full-scale invasion of Ukraine. Prior to the court proceedings, a protest was held demanding the release of the Ukrainian national. According to DW, citing lawyer Jes Meyer-Lohkamp, the accused intends to refuse to testify on the substance of the case. The lawyer also referenced an appeal made to German authorities by Roman Chervinsky, a former commander of Kuznetsov and a Ukrainian serviceman, who is believed to be the mastermind behind the sabotage. Chervinsky's appeal states that Kuznetsov is prohibited from disclosing details of his service actions, even in court, under threat of imprisonment in Ukraine.