Growing discord has started to emerge hours before Sunday afternoon's Eurozone summit which is due to decide whether to grant Greece another bailout package or move to "Plan B".
According to media reports, Eurozone finance ministers have demanded deeper reforms from Greece in exchange for opening talks on a third bailout to Athens.
Fifteen EU and Energy Community countries in Central Eastern Europe and Southeastern Europe agreed on Friday to join forces to speed up the creation of missing gas infrastructure links, the European Commission said.
German Chancellor Angela Merkel dismissed the option of writing off Greek debt.
EU leaders are due to hold a full (EU-28) summit in another attempt to look for a viable solution on Greece, Italian PM Matteo Renzi has said.
The Eurozone would like to receive a new letter with reform proposals from Greece, Eurogroup head Jeroen Dijsselbloem has said.
European Commission President Jean-Claude Juncker and European Parliament President Martin Schulz expressed opposition to Greece leaving the eurozone.
The Hungarian Parliament approved on Monday the construction of a fence along the border with Serbia as a measure towards reducing the influx of refugees.
Eurozone leaders are expected to convene at an emergency summit on Tuesday to discuss the situation in Greece after Greek citizens rejected the proposals of creditors at the Sunday referendum.
In response to the Greek referendum, the Eurozone leaders have decided to discuss the stuation at an extraordinary meeting to be held Tuesday, the Bulgraian National Radio reported.
Germany and other countries from the Eurozone will be able to get back the unused funding from the second Greek bailout program that officially expired on July 30, as reported by Focus online.
The Eurogroup on Wednesday said it was ending contact maintained with Greece on a daily basis until the referendum on a bailout proposals made to the country is held Sunday.
The Eurogroup rejected on Tuesday the request of the Greek government to extend the bailout programme of the country.
The eurozone finance minister will discuss at an emergency conference call the latest Greek proposal, which was submitted by the government earlier on Tuesday.
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