A war crimes trial has opened at Germany's Oberlandesgericht Hamburg against Serhij K., a former Ukrainian military officer accused of leading the team that sabotaged the Nord Stream gas pipelines in September 2022, according to tagesschau; ARD correspondent Michael Götschenberg confirmed the charge is war crimes (tagesschau).

German federal prosecutors go further than in earlier Nord Stream investigations: the indictment states that the defendant acted on behalf of Ukrainian state bodies, according to tagesschau's 11KM podcast and journalist Bojan Pancevski (Welt).

Kyiv has instructed Serhij K. to stay silent during the proceedings, and Ukrainian children reportedly regard him as a hero, the Frankfurter Allgemeine Zeitung reports.

Marc Henrichmann, the CDU chair of the Bundestag's Parliamentary Control Panel, said the trial will bring facts to light that leave Germans "nachdenklich" — unsettled — but insisted that even a confirmed Ukrainian link must not lead Berlin to drop Ukraine, "auf gar keinen Fall" (Welt).

Hypothesis: a courtroom finding of Ukrainian state responsibility could feed arguments in Western capitals for recalibrating sanctions or aid conditionality, and hand Moscow a propaganda opening on who was really behind the sabotage. Supporting this: Henrichmann's pre-emptive defense of Ukraine suggests German officials already expect political fallout. Against this: none of the reporting cited here shows any government has linked this trial to sanctions policy, and Berlin's coalition signals continued backing regardless of the verdict.

What to watch: whether prosecutors name the Ukrainian agency allegedly behind the operation, how Kyiv responds officially, and whether other NATO governments echo Henrichmann's view that responsibility for Nord Stream will not change their support for Ukraine.