As the trade war heats up, Chinese media has threatened the US with the possibility of a ban on sales of rare-earth elements, materials critical to the production of cutting-edge weapons.

The US is largely dependent on China for the rare-earth materials that go into its products, and that includes Department of Defense products like guided-missile destroyers and F-35 stealth jets.

The F-35 Lightning II Joint Strike Fighter, for example, requires 920 pounds of rare-earth materials. Several other systems also require these elements.

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China is threatening the US with the possibility that it may withhold rare-earth elements critical to the production of a number of different US products, including missiles and stealth fighters.

The US has been turning up the heat on China in the ongoing trade war. Now Chinese media is warning that China can up the stakes.

"United States, don't underestimate China's ability to strike back," the People's Daily, the paper of the ruling Chinese Communist Party, wrote Wednesday, according to Reuters.

"Will rare earths become a counter weapon for China to hit back against the pressure the United States has put on for no reason at all? The answer is no mystery," the newspaper said in a commentary, ominously adding, "Don't say we didn't warn you!"

Other Chinese media outlets released similar articles.

Rare-earth elements, of which China produces the overwhelming majority, play an important role in the production of defense systems. For example, a US Navy Virginia-class nuclear-powered fast-attack submarine requires 9,200 pounds of rare-earth metals, while an Arleigh Burke-class guided-missile destroyer needs 5,200 pounds.

US defense contractors such as Raytheon and Lockheed Martin use rare-earth metals to make high-end guidance systems and sensors for missiles and other military platforms, Reuters reported.

An F-35 Lightning II Joint Strike Fighter, a fifth-generation stealth jet built to give the US an edge over rivals like China, requires 920 pounds of rare-earth materials, according to Asia Times, which reported that the US has an almost nonexistent ability to produce rare-earth materials.

"The US side wants to use the products made by China's exported rare earths to counter and suppress China's development," the People's Daily said on Wednesday. "The Chinese people will never accept this!"

The paper's rhetoric suggests that China would intentionally take aim at the US defense sector, which Beijing believes is working to contain China's rise.

The US relies on China for as much as 80% of its rare-earth materials, according to Bloomberg. "Rare earths are a niche specialty and critical to the Defense Department," Simon Moores, the managing director at Benchmark Mineral Intelligence, told the outlet.

"Rare earths are essential to the production, sustainment, and operation of US military equipment," a 2016 Government Accountability Office report said. "Reliable access to the necessary material, regardless of the overall level of defense demand, is a bedrock requirement for DOD."

If China were to pull the plug, it could certainly lead to complications, although there is the possibility that the department could turn to alternative sources, given that its requirement is only 1% of the total US demand for rare-earth elements.

Beijing has not yet said that it will take this step, but it is certainly troubling that Chinese media is threatening this move as a response to US actions in the trade war.