As he walked into the summit dominated by Greece and migration, Cameron said it marked a "significant milestone" in Britain's bid to renegotiate ties with the European Union before a referendum due by the end of 2017.
Sources expect European leaders to discuss his proposals only briefly today night before agreeing to move to the next stage in the process -- technical talks. The issue is thought likely to be mentioned briefly in the final summit communique.
Few leaders commented on Britain's prospects for securing change as they arrived for the high-stakes summit, although countries including France have made clear they are wary of the proposals.
But Martin Schulz, president of the European Parliament, fired a shot across the bows of Cameron, who has insisted the changes he wants require treaty change.
"I think treaty change is quite difficult and the UK government should not only exclusively focus on treaty change," he said.
"But if it involves dismantling European unity and rolling back the eurozone, we are against that," Michel added.
Estonian premier Taavi Roivas said he was ready to listen to Cameron's proposals but added: "The EU is stronger with Britain inside and I also believe that Britain is much more prosperous inside the EU".
Queen Elizabeth II used a state visit to Germany yesterday, during which Cameron also held talks with Chancellor Angela Merkel, to warn that "division in Europe is dangerous" .
