How has President Biden's approach to Ukraine-Russia negotiations shifted, and what concerns has it raised among allies?

President Biden has adopted a more defensive posture regarding Ukraine negotiations, suggesting that Ukraine could end the war and should have prevented it. This represents a significant shift in rhetoric that appears to place some blame on Ukraine rather than focusing solely on Russia's aggression. Biden's comments about feeling more confident after talks with Russia without Ukraine's participation have alarmed NATO and European allies. These allies are now holding emergency meetings in Paris, concerned that the U.S. might pressure Ukraine into accepting an unfavorable peace deal without proper representation at the negotiating table. Ukraine maintains it won't accept any agreement in which they don't participate.