黄金、白银，再度跳水！美股指期货，全线低开！

Market Overview - Spot silver continues to decline, with a daily drop of 10%, currently at $76.89 per ounce [1] - Spot gold has fallen below $4,700, down 3.33% for the day [1] - U.S. stock futures are lower, with Nasdaq 100 futures down over 1% and S&P 500 futures down 0.6% [1] - International crude oil prices opened lower, with WTI and Brent both down over 2%, at $63 per barrel and $67 per barrel respectively [1] - Recent increases in oil prices were driven by market concerns over potential U.S. military action against Iran [1] Geopolitical Developments - Iranian Foreign Minister Abbas Araghchi expressed confidence in reaching an agreement with the U.S. on nuclear issues, despite losing trust in the U.S. as a negotiating partner [2] - Araghchi emphasized the importance of substantive negotiations over the format and reiterated Iran's desire for the U.S. to lift long-standing sanctions [2] - Israeli Defense Forces Chief of Staff Aviv Kochavi held intensive talks with U.S. officials in Washington, focusing on the possibility of military action against Iran and tactical coordination between the U.S. and Israel [3] - The Israeli military seeks advance warning from the U.S. before any potential strikes on Iran to prepare for defense [4] Historical Context - The U.S. has been increasing pressure on Iran, deploying multiple naval vessels, including aircraft carriers, in the region [5] - The U.S. unilaterally withdrew from the Iran nuclear deal in 2018 and reimposed sanctions, leading to a series of indirect negotiations that have faced interruptions due to military conflicts [5]