Group 1 - The price of samarium has surged by 60 times, significantly increasing the costs for the U.S. defense industry, with production lines for F-35 jets nearing a halt [1][3] - Samarium is a critical rare earth element used in military applications due to its high-temperature resistance and strong magnetic properties, essential for various advanced weapon systems [3][5] - The U.S. is heavily reliant on China for rare earth elements, with over 90% of global refining capacity controlled by China and a dependency rate of over 95% for U.S. defense needs [5][6] Group 2 - China has implemented export controls on samarium and other heavy rare earths, prohibiting their use in military applications, which complicates U.S. military procurement efforts [5][10] - The U.S. is actively seeking alternative suppliers and attempting to rebuild its domestic rare earth supply chain, but these efforts are seen as unrealistic given the established dominance of China's industry [6][8] - The situation highlights a strategic power shift, with China holding the upper hand in the rare earth supply chain, impacting U.S. military capabilities and deterrence strategies [10]