China has a monopoly position in the production of many rare earth elements, and has "showed itself willing to exploit that monopoly to the fullest":
Rare and Foolish, by Paul Krugman, Commentary, NY Times: Last month a Chinese trawler operating in Japanese-controlled waters collided with two vessels of Japan’s Coast Guard. Japan detained the trawler’s captain; China responded by cutting off Japan’s access to crucial raw materials.
And there was nowhere else to turn: China accounts for 97 percent of the world’s supply of rare earths, minerals that play an essential role in many high-technology products, including military equipment. Sure enough, Japan soon let the captain go. ...
Some background: The rare earths ... play a crucial role in applications ranging from hybrid motors to fiber optics. Until the mid-1980s the United States dominated production, but then China moved in. ...
China has about a third of the world’s rare earth deposits. This relative abundance, combined with low extraction and processing costs — reflecting both low wages and weak environmental standards — allowed China’s producers to undercut the U.S. industry.
You really have to wonder why nobody raised an alarm while this was happening, if only on national security grounds. But policy makers simply stood by as the U.S. rare earth industry shut down. In at least one case, in 2003 — a time when, if you believed the Bush administration, considerations of national security governed every aspect of U.S. policy — the Chinese literally packed up all the equipment in a U.S. production facility and shipped it to China.
The result was a monopoly position... And ... China showed itself willing to exploit that monopoly to the fullest. The United Steelworkers recently filed a complaint against Chinese trade practices, stepping in where U.S. businesses fear to tread because they fear Chinese retaliation. The union put China’s imposition of export restrictions and taxes on rare earths — restrictions that give Chinese production in a number of industries an important competitive advantage — at the top of the list.
Then came the trawler event. Chinese restrictions on rare earth exports were already in violation of agreements China made before joining the World Trade Organization. But the embargo on rare earth exports to Japan was an even more blatant violation of international trade law.
Oh, and Chinese officials have not improved matters by insulting our intelligence, claiming that there was no official embargo. All of China’s rare earth exporters, they say — some of them foreign-owned — simultaneously decided to halt shipments because of their personal feelings toward Japan. Right.
So what are the lessons of the rare earth fracas?
First, and most obviously, the world needs to develop non-Chinese sources of these materials. There are extensive rare earth deposits in the United States and elsewhere. ...
Second, China’s response to the trawler incident is, I’m sorry to say, further evidence that the world’s newest economic superpower isn’t prepared to assume the responsibilities that go with that status.
Major economic powers, realizing that they have an important stake in the international system, are normally very hesitant about resorting to economic warfare, even in the face of severe provocation — witness the way U.S. policy makers have agonized and temporized over ... China’s grossly protectionist exchange-rate policy. China, however, showed no hesitation at all about using its trade muscle to get its way in a political dispute, in clear — if denied — violation of international trade law.
Couple the rare earth story with China’s behavior on other fronts — the state subsidies that help firms gain key contracts, the pressure on foreign companies to move production to China and, above all, that exchange-rate policy — and what you have is a portrait of a rogue economic superpower, unwilling to play by the rules. And the question is what the rest of us are going to do about it.