俄美欧乌，关键时刻

Group 1 - The core viewpoint of the article revolves around the upcoming meeting between US President Trump and Russian President Putin, which is described as a "test meeting" with uncertain outcomes [2][12][14] - Trump expressed a desire for constructive dialogue with Putin and indicated that he hopes to arrange a meeting between Ukrainian President Zelensky and Putin after their meeting [4][10][11] - There is a suggestion that Ukraine may soften its stance regarding territorial concessions as part of a European-supported peace plan [5][6][24] Group 2 - The article highlights the need for clear security guarantees for Ukraine, as emphasized by President Zelensky during his discussions with Canadian and Lithuanian leaders [22][24] - European leaders are coordinating their positions ahead of the US-Russia summit, stressing that any diplomatic solution must protect Ukraine and European security interests [26][28] - The EU is preparing to implement further sanctions against Russia and provide additional support to Ukraine, including military assistance [28]