美军机活动显著增加

Group 1 - The article highlights an increase in U.S. military aircraft activities at the Al Udeid Air Base in Qatar, which is significant given the current tensions with Iran [1][2] - Various U.S. military aircraft, including KC-135 refueling planes and B-52 strategic bombers, were reported to have taken off from the Al Udeid Air Base on the night of January 11 [2] - The Al Udeid Air Base is one of the largest U.S. military bases in the Gulf region, located approximately 35 kilometers southwest of Doha and 200-300 kilometers from the Iranian border, with over 10,000 U.S. troops stationed there [2] Group 2 - U.S. President Trump has indicated that diplomacy is the preferred option regarding the current situation with Iran, but military action will be considered if necessary [3] - The U.S. State Department has issued an urgent security warning, advising American citizens to leave Iran immediately and to prepare for self-reliant exit plans without government assistance [4] - The warning includes recommendations for Americans to stay in safe locations, stock up on essential supplies, avoid demonstrations, and stay informed through local media [4]