The International Court of Justice has ordered a temporary halt to Japan's annual slaughter of whales in the southern ocean after concluding that the hunts are not, as Japan claims, conducted for scientific research.
The UN court's decision, by a 12-4 majority among a panel of judges, casts serious doubt over the long-term future of the jewel in the crown of Japan's controversial whaling programme.
It also marks a dramatic victory for the Australian government, whose four-year campaign to ban the hunts rested on whether it could convince the court that Japan was using scientific research as a cover for commercial whaling.
In its 2010 application to the court, Australia accused Japan of failing to "observe in good faith the zero catch limit in relation to the killing of whales".
Under the International Whaling Commission's 1986 ban on commercial whaling, Japan was permitted to kill a certain number of whales every year for what it called scientific research.