The EU said it has cancelled a full 28-nation summit on Sunday to decide Greece's fate in the single European currency as eurozone finance ministers continue "difficult" reform-for-bailout talks with Athens.

"I have cancelled EUCO (the European Union summit) today," European Council President Donald Tusk said in a tweet, adding that a summit of 19 eurozone leaders will be held at 1400 GMT and "last until we conclude talks on Greece." The move came after divided eurozone finance ministers held "very difficult" talks on Greece late into the night on Friday.