The United States controls how the war in the Ukraine proceeds and always has. Former German Chancellor Gerhard Schroeder said it was the American side which scuttled any chance of peace in Ukraine as early as March 2022, soon after the war began. "The only people who could resolve the war over Ukraine are the Americans. During the peace talks in March 2022 in Istanbul, Ukrainians did not agree to peace because they were not allowed to. They had to coordinate everything they talked about with the Americans first. However, nothing eventually happened. My impression is that nothing could happen because everything was decided in Washington."
Fast-forward to 2023 and the story is different. Earlier this month NBC News quietly released a report which said U.S. and European officials broached the topic of peace negotiations with Ukraine, including "very broad outlines of what Ukraine might need to give up to reach a deal with Russia." NBC said "the discussions are an acknowledgment of the dynamics militarily on the ground in Ukraine and politically in the U.S. and Europe."