Australia (with support from New Zealand) has won against Japan in the International Court of Justice with a 12-4 ruling that Japan’s whaling programme is not scientific research and it has stated that Japan should not issue any further permits.
The decisions of the ICJ are final and can not be appealed. Of course a state could refuse to implement them, but the reputational loss would be massive.
Japan may halt their whaling programme entirely, or try and create a new “scientific” programme in the future. It has been suggested in the past that they wanted to end it anyway, but didn’t want to be seen giving into the quasi-terrorism of Sea Shepherd. So hopefully they will accept the court ruling, abandon the pretense that the whaling was for scientific purposes and cease operations. That would be a good thing.