美军机活动“显著增加”，距伊朗边境直线200公里，约1万名美军驻扎

Group 1: Military Activities - The activity of U.S. military aircraft at the Al Udeid Air Base in Qatar has significantly increased, with multiple aircraft including KC-135R refueling planes and B-52 bombers reported to have taken off on January 11 [1][12] - Al Udeid Air Base, located approximately 35 kilometers southwest of Doha and about 200 kilometers from the Iranian border, is one of the largest U.S. military bases in the Gulf region, housing around 10,000 U.S. troops [1][12] Group 2: U.S.-Iran Relations - The U.S. State Department has urged American citizens to leave Iran immediately, indicating rising tensions [4][12] - Iranian officials, including Speaker of Parliament Mohammad Baqer Qalibaf, have warned that any attack on Iran will result in retaliation against U.S. and Israeli military bases in the region [5][12] - Iranian Supreme Leader Ali Khamenei praised the Iranian people for thwarting foreign plots and warned U.S. politicians to cease deceptive practices [7][14] Group 3: Military Preparedness - Iranian Foreign Minister Mohammad Javad Zarif stated that Iran is prepared for any potential military action from the U.S. and emphasized that the current military readiness is extensive compared to previous conflicts [8][14] - Iran's Defense Minister warned that any attack on Iran's national interests would lead to strikes against enemy facilities anywhere [15] Group 4: Economic Measures - President Donald Trump announced a 25% tariff on any country conducting business with Iran, effective immediately, stating that this decision is final and unchangeable [10][16][18]