Why are European leaders concerned about the U.S. peace strategy for Russia and Ukraine?

European leaders are concerned about the U.S. peace process because they view the starting point as unacceptable, considering the conflict potentially existential for the European continent. The emergency meeting in Paris reflects their anxiety about giving ground to Russia in negotiations. However, as Bill Roggio points out, if Europeans are dissatisfied with American approaches, they could take more responsibility by increasing their defense budgets, producing weapons, and even deploying their own troops in Ukraine rather than relying primarily on U.S. support.