European Union leaders are expressing growing dissatisfaction that British Prime Minister David Cameron has yet to come up with any concrete proposals for EU reform.
Ahead of a summit of EU leaders where the issue will only be discussed casually, European Commission President Jean-Claude Juncker told the European Parliament that he "cannot say that much progress has been made".
Juncker said he wanted Britain to stay in the EU, but added that "it takes two to tango".
"So if we have to dance, our British friends should dance too," Junker said.
In May, David Cameron launched a campaign against the way the EU is run and wants to reduce the Union's powers over member states.
He plans to hold a referendum before the end of 2017 on whether Great Britain should leave the EU.
Britain wants to tackle the EU's fundamental social and economic rules and agreements among its members so that states gain more autonomy in decision-making at the expense of institutions in Brussels.
Before tomorrow's summit, Cameron and Juncker will have lunch together, and the British prime minister will have numerous bilateral meetings with other leaders.
He then plans a tour of European capitals to examine what reforms can be proposed.
The institutions of the EU and individual member states want a breakthrough in this matter and are eagerly waiting for Britain to present its demands, so that it is clear to everyone what reforms are required, said an EU diplomat who wished to remain anonymous.
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