Today Japan released the boat's Chinese skipper, who had been accused of bashing into the two Japanese vessels deliberately. With the release of the captain, Zhan Qixiong, the diplomatic world breathes a sigh of relief. But how to score this match? Japan comes off looking weak, as it succumbs to an avalanche of pressure. But the ferocity of the Chinese response has harmed China ultimately, by undermining confidence in China as a responsible stakeholder in the region.

Japan’s prosecutors chose not to indict Mr Zhan on the grounds that his act was not premeditated, according to Kyodo, the Japanese news agency. But the real reason was the vehemence of China's reaction. Since the fishing crew and its captain were arrested, China has continually ratcheted up the pressure to have them returned. It cut diplomatic communications and even arrested four Japanese nationals, allegedly for filming in a restricted military area. China’s response seemed to take an especially nefarious turn when it apparently suspended its export of rare-earth minerals, which are vital to making electronics components used in everything from handheld gadgets to cars. On September 23rd China emphatically denied that it is blocking exports. And this may be true: there probably isn't a formal directive. But in a country where informal rules abound, exporters know that it can pay to withhold shipments—in solidarity with a government that is angry at its neighbour.

At its heart, the squabble was not only about the Senkaku islands, called the Diaoyu by the Chinese, where the boat collision took place earlier this month. Instead, it was likely a message to other countries with which China has territorial disputes, particularly in the South China Sea. This week China showed that it is willing to go to extraordinary lengths to exert its maritime claims. Lately it has taken to calling the South China Sea, which it disputes with five of its South-East Asian neighbours, a "core national interest".

Moreover, it forced the new Japanese government and Naoto Kan, its prime minister, to make a hard choice: between a handful of uninhabited rocks, far from Japan's main islands, and the future of its economy. Japan's decision not to go to the wall for its territorial claims looks refreshingly expedient, but it may come to haunt it in the long term.

This has also been a test of China, though in a way the country seems not to understand it. Its actions have called into question its maturity as a responsible international actor and undermined its pretensions to a "peaceful rise". Other states observe a host of traditions to help see them work through border disputes and express their displeasure with one another. The melodrama of China's reaction, entirely disproportionate to the matter at hand, made it impossible for the two sides to find a mutually acceptable outcome. The acute crisis may be over but this resolution is sure to usher in an extended period of chill between the countries.

Which is a terrible outcome. Until recently, both countries had seen their economies flourishing as a result of strengthening trade ties. Since 2009 China has been Japan’s number-one trading partner. And the new Democratic Party of Japan government is the most pro-China administration in recently times. All this goodwill is lost.