British Prime Minister David Cameron and French President Nicolas Sarkozy have exchanged angry words over the United Kingdom's involvement in discussions about the eurozone crisis.
Mr Sarkozy believes the final talks on Wednesday should be limited to nations which actually use the euro, the BBC reports.
Mr Cameron said all European Union leaders should be present to debate issues that could affect them in one way or another.
The clash came on the day when leaders agreed to change the EU's treaty if necessary to help resolve the crisis.
All EU leaders are now set to attend the final meeting on Wednesday, which was originally meant to be attended by only the 17 countries that use the euro.
That prompted Mr Sarkozy to speak out, the BBC says. It quotes Mr Sarkozy as saying he was sick of reading in newspapers about advice Mr Cameron and his Chancellor George Osborne were offering the eurozone.
At one point in the exchanges, Mr Sarkozy was quoted as telling Mr Cameron: "We are sick of you criticising us and telling us what to do.You say you hate the euro and now you want to interfere in our meetings."
On Sunday morning the leaders of all the EU's 27 members held talks about the Greek debt crisis, recapitalising banks, and bolstering the bailout fund.