EU leaders will hold a further summit on Sunday to approve a plan to aid Greece if creditor institutions are satisfied.
Less than 24 hours after he wrote a conciliatory letter to creditors asking for a new bailout, Tsipras abruptly switched back into combative mode.
UK prime minister David Cameron will attempt to set out his intentions to renegotiate the UK's terms of its EU membership.
Excessive fiscal policy tightening within a euro straitjacket is not a good idea.
A reform proposal from Greek Prime Minister Alexis Tsipras was rejected by Eurozone officials
A female protester seeking to "End the ECB Dick-tatorship" interrupted a press conference.
It was unclear if Greek Prime Minister Alexis Tsipras and German Chancellor Angela Merkel had narrowed differences on economic reforms for Greece.
Pablo Iglesias is on a mission to save Spain.
Athens pledged not to roll back any reforms that could have a negative fiscal impact and to honor all its debts.
Greek banks are losing around 2 billion euros of deposits a week.
Yanis Varoufakis played down a failure to reach a common position with the rest of the euro zone, saying he believed a "healing deal" was possible.
This is make or break for Europe's populist parties. And Germany's leadership of Europe.
Labor unions accused the government of trying to take the labor market back to "medieval times" and of implementing policies that are causing a "humanitarian crisis"
Clashes broke out as the march ended, and police fired teargas at groups of youths who hurled stones and plastic bottles.