贝森特对中国喊话，美国手里有反制稀土秘诀，话音刚落俄罗斯就对华伸出援手

Group 1 - The complexity of the US-China competition is increasing, with US Treasury Secretary Yellen claiming that the US has various leverage points, such as China's restrictions on rare earth exports, while the US holds advantages in aircraft engines and certain chemicals [1][3] - The effectiveness of the US's leverage in aircraft engines may be overestimated, as China's COMAC has reduced its delivery target for the C919 aircraft from 75 to 25 units due to US sanctions, highlighting vulnerabilities in China's high-end manufacturing [3][6] - The global supply chain is not as one-dimensional as perceived; US companies are also deeply integrated into the aviation industry's supply chain, and strict measures against China could harm US companies reliant on the Chinese market [5][6] Group 2 - Russia's support provides China with new strategic options, as Russia is willing to supply components for China's domestic aircraft, particularly in heavy engines and composite materials, which could counterbalance US technological dominance [6][7] - The unilateral policies of the US since the Trump administration have contributed to the fragmentation of global supply chains and increased tensions between nations, suggesting that Yellen's threats may be more of a strategic bluff [6][9] - The control of rare earth resources by China is significant, as the US would require substantial investment and time to replicate China's mining and processing capabilities, making Yellen's threats appear less credible [7][9]