欧洲领导人集体赴美，在“撑腰”的外衣下，或有更重要的交易要谈

Group 1 - The core viewpoint of the article revolves around the geopolitical dynamics involving Ukraine, the U.S., and Europe, particularly in the context of energy security and negotiations following the recent tensions between the U.S. and Russia [1][3][10] - European leaders are accompanying Zelensky to the U.S. to prevent a repeat of past diplomatic failures and to exert collective pressure on the U.S. regarding energy and security interests [3][10][12] - The potential U.S. involvement in the operation of the Nord Stream pipeline raises concerns for Europe, as it could lead to increased gas prices and profit sharing with the U.S., undermining Europe's previous sanctions against Russia [5][6][10] Group 2 - The Nord Stream pipeline is critical for Europe, supplying 55 billion cubic meters of gas annually at lower prices compared to U.S. liquefied natural gas [5][6] - There are fears that the U.S. and Russia may use Ukraine as a bargaining chip in energy negotiations, which could lead to territorial concessions from Ukraine and diminish European leverage [8][10][12] - Europe is beginning to recognize the need for strategic autonomy, as evidenced by proposals for a €800 billion defense initiative, indicating a shift towards self-reliance in security matters [12][14] Group 3 - The collective visit by European leaders serves a dual purpose: to support Ukraine and to assert European interests in the face of U.S. and Russian negotiations [10][14] - There is potential for Europe to form new alliances with emerging economies like China and India to balance energy market dynamics and reduce dependency on the U.S. and Russia [15] - Increased military aid to Ukraine from Europe could enhance its bargaining position against Russia, thereby strengthening Europe's overall negotiating power [15]