EU leaders are meeting without Britain for the first time to rethink their union and keep it from disintegrating after Britain's unprecedented vote to leave.

Divisions between the EU founders and newer countries in the east threaten to complicate any bold new plans at Wednesday's meeting.

Dutch Prime Minister Mark Rutte says: "It's not only the British voters who have doubts about European cooperation. There is skepticism in many other EU countries."

Other EU countries are now facing calls, especially from the far right, for referendums on quitting the bloc. The 27 remaining EU members are also divided over how to deal with migration, which was a major issue in Britain's vote last week.

British Prime Minister David Cameron left Brussels Tuesday night without any clear divorce plan.