What concerns have been raised about the recent US-Russia negotiations regarding Ukraine?

The recent US-Russia negotiations in Saudi Arabia raised significant concerns about the exclusion of Ukrainian leadership from the peace talks. Ukrainian President Volodymyr Zelenskyy explicitly stated that he wasn't invited to the discussions where four broad principles outlining negotiations and a path forward were agreed upon. While many acknowledge Russia needs to be at the table as the aggressor in this war, questions remain about Europe's role and, more critically, Ukraine's absence from negotiations directly affecting its future. This exclusion highlights a troubling dynamic in the peace process where decisions are being made about Ukraine without Ukrainian representation, undermining the principle that all stakeholders should be included in conflict resolution efforts.