What are the key concerns about the recent US-Russia negotiations regarding Ukraine?

The US and Russia have agreed to four broad principles outlining negotiations and a path forward, with talks taking place in Saudi Arabia. While many agree Russia needs to be at the table as the aggressor in the war, significant concerns have emerged about representation in these discussions. Notably, Ukrainian President Volodymyr Zelensky has stated he wasn't invited to these talks, raising questions about Ukraine's role in negotiations that directly impact its future. The absence of Ukraine and European representation at these discussions has become a critical issue, as decisions are being made about the war without input from the country most affected by the conflict.