The nature of US power has shifted from “smart power” under Obama administration to “peremptory power” under Trump administration，which means high pragmatism，not providing public goods，rude behaviors，and “weaponizing” economic interdependence. The US which embraces “rude power”，has severely hampered the transatlantic partnership which is interdependent economically，and of security alliance. In face of the US transfer to “peremptory power”，European countries and the Europe Union hope to improve their bargaining power through solidarity and enhancing independence，mainly to take the advantage of their specialty to counteract in economic and norm fields，but they have shown division and powerless in reality. China-US competition has also brought about “negative effects” to Europe. European countries’ different attitudes towards China’s Huawei 5G technology have demonstrated their security dependence on the US.