By trying to turn it back on again.
And thus threatening to observe far-off galaxies and supermassive black holes without Germany’s expressed written permission. This clearly goes beyond the scope of the telescope’s mission. Somebody make them stop or something.
Russia Trying to Hijack German Telescope – After being banned from involvement in a cooperative X-ray telescope project with Germany in the wake of the invasion of Ukraine, Russia is now seeking to operate the telescope without Germany’s input.
“Despite Germany’s demand to shut down one of the two telescopes at Spektr-RG, Russian specialists insist on continuing its work.”