U.S. Secretary of State Antony Blinken speaks at a news conference during U.S.-Mexico High-Level Economic Dialogue at the State Department in Washington, U.S., September 29, 2023. REUTERS/Leah Millis/File Photo Acquire Licensing Rights WASHINGTON, Oct 6 (Reuters) - Early in the Biden administration, U.S. Secretary of State Antony Blinken vowed that the United States would only hold talks with China if they led to "tangible outcomes" to resolve disputes between the strategic rivals. Two-and-a-half years later, that approach appears to have changed. Since the start of the summer, the administration has embarked on a largely unreciprocated push to talk with Beijing,...