美国再度放话，对华发出芯片、关税警告，俄方抓住机会送上定心丸

Group 1 - The U.S. is issuing dual warnings to China regarding chip technology and tariffs, indicating a potential escalation in trade tensions [1][5] - President Trump emphasized that the most advanced chips from Nvidia will not be allowed to reach China, asserting that only the U.S. will possess such technology [3] - Trump's comments suggest that while he may allow Nvidia to engage in transactions with China, the most advanced versions of chips will remain exclusive to the U.S. [3] Group 2 - U.S. Treasury Secretary Yellen expressed concerns over China's future rare earth policies and hinted at the possibility of imposing additional tariffs on China, citing unreliability as a partner [5] - The U.S. has a history of frequently changing its stance in trade negotiations, undermining mutual trust between the two nations [5][7] - The U.S. approach is characterized by unilateralism and protectionism, which has led to strategic dilemmas rather than successful outcomes [7] Group 3 - Russia is seizing the opportunity to strengthen ties with China amidst the uncertain U.S.-China relationship, with Prime Minister Mishustin emphasizing the importance of Sino-Russian relations [7][9] - Despite facing sanctions from Western countries, Russia is keen to deepen its relationship with China, viewing it as a critical partnership [9] - China maintains a principled stance in its foreign relations, indicating that its approach towards the U.S. and Russia are independent of each other [9]