[Greek flag flutters in the wind as tourists visit the archaeological site of the Acropolis hill in Athens, Greece]Germany's government said on Friday it remained united on the need to stabilise the Greek economy despite indications of divergent views between Chancellor Angela Merkel's conservatives and their Social Democratic coalition partners. Spokeswoman Ulrike Demmer declined to comment on a newspaper report that Foreign Minister Sigmar Gabriel had criticised the government's handling of Greece in a letter to Merkel last month and had suggested easing a surplus requirement. Greece needs a new tranche of financial aid under its 86 billion euro bailout by the third quarter of the year or it faces the risk of defaulting on its debts.