Eurozone leaders will fight to the finish to keep near-bankrupt Greece in the eurozone Sunday after the European Union's chairman canceled a planned summit of all 28 EU leaders that would have been needed in case of a "Grexit."

In return, leftist Prime Minister Alexis Tsipras will be required to enact key legislation in parliament Monday to start restoring the broken trust of his partners in the 19-nation currency union to win a third bailout, ministers said.

European Council President Donald Tusk announced that he had called off the tentatively planned meeting of EU heads of state and government, saying the eurozone summit to start at 4 p.m. would "last until we conclude talks on Greece."