What is the dynamic between European countries and the United States regarding Ukraine in the ongoing conflict?

European countries, despite being geographically closer to Ukraine (which borders Hungary, Poland, and Romania), have shown hesitancy to take decisive action despite increasing their defense spending. Instead, they expect the United States to bear the financial burden of supporting Ukraine against Russian aggression. The Trump administration has been pushing European nations to take a leading role in the conflict, arguing that since Ukraine is on their continent, they should step up with both defense spending and diplomatic efforts. This dynamic was highlighted in recent diplomatic developments where Russia and the US met in Saudi Arabia to discuss the war, notably without Ukrainian officials present, causing concern for President Zelensky who stated Ukraine would not accept any outcome from talks in which they weren't involved.