President Trump’s decision to send troops into an American city comes just days before a rare military display in the nation’s capital.

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The Pentagon mobilized 700 Marines and 2,000 more National Guard troops even as the president said the situation was “under control.” Gov. Gavin Newsom condemned the escalating response.

© Gabriela Bhaskar/The New York Times

中国在全球稀土供应链上占主导地位，五角大楼和国防承包商严重依赖在中国开采或加工的稀土矿物和磁铁。专家称中国限制关键矿产和磁铁出口是对美国国家安全发出的警告。

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稀土矿物几乎出现在美国所有形式的国防技术中。它们可以形成非常强大的磁铁，用于战斗机、军舰、导弹、坦克和激光器。