It would be hard to find a reason. It's the Baltic Sea. Maybe Germany was feeling its oats and thought to ask "May I see your papers?" The Sea is so narrow, I'm not sure there is really any international water there. If it really was headed to Russia, and the Germans interdicted it, that would be an embargo, which is an act of war.
I hope and expect this will blow over. If it gets to the stage of an embargo, Russia would doubtless protest. Then the Germans would let it go. Then the tanker could be mysteriously torpedoed, and an international incident would result.
Panamanian flag. https://www.vesselfinder.com/vessels/details/9308065
I am not questioning that, but I did skim the article where it said Russia was not recognizing it.
It may have been bound for Russia, but what would "recognizing it" mean? It's not their ship, either by legal possession or registry.
They are not going to war over it? My assumption.
It would be hard to find a reason. It's the Baltic Sea. Maybe Germany was feeling its oats and thought to ask "May I see your papers?" The Sea is so narrow, I'm not sure there is really any international water there. If it really was headed to Russia, and the Germans interdicted it, that would be an embargo, which is an act of war.
I hope and expect this will blow over. If it gets to the stage of an embargo, Russia would doubtless protest. Then the Germans would let it go. Then the tanker could be mysteriously torpedoed, and an international incident would result.