The trade fight with China is hitting the U.S. in two directions. The huge tariff barriers erected by both countries put the brightest spotlight on the massive amount of Chinese-made goods—$438.9 billion last year—that pack containerships and cargo planes heading to U.

MP Materials said on Thursday it had stopped shipping rare earth concentrate to China in response to the that nation's retaliatory tariffs and export controls following the levies imposed by U.S. President Donald Trump,

Beijing has suspended exports of certain rare earth minerals and magnets that are crucial for the world’s car, semiconductor and aerospace industries.