Greek Prime Minister Alexis Tsipras expressed his government's frustration with creditors' demands for austerity measures during talks with the leaders of France and Germany on Friday, a Greek government official said. German Chancellor Angela Merkel and French President Francois Hollande had a private meeting with Tsipras before the final session of an EU summit in Brussels, urging Greece to accept a cash-for-reforms deal on Saturday to avert a default. "Tsipras briefed the two leaders on the Greek proposal and underlined that the Greek side does not understand the insistence of the institutions on such harsh measures," the official said.