Why is Europe more concerned about Donald Trump than Vladimir Putin?

Europe is experiencing heightened anxiety about Donald Trump because they feel sidelined in critical diplomatic processes, as evidenced by recent American and Russian meetings in Riyadh that occurred without European participation. These diplomatic moves have caused significant unease across European capitals. The primary concern is that Washington's actions appear to be emboldening Moscow, potentially weakening Europe's security position. European leaders worry that their strategic interests are being overlooked in discussions between the major powers, creating a diplomatic environment where they feel marginalized despite having substantial stakes in regional security matters.