Greek Prime Minister George Papandreou arrives at the European Council building ahead of an European Union leaders summit in Brussels June 23, 2011. EU heads of states and government are expected to take decision at their gathering in Brussels which will strengthen the stability of the euro zone, German Chancellor Angela Merkel said on Thursday. Merkel reiterated, however, no formal decisions on Greece are expected at the fourth EU summit this year. REUTERS/Francois Lenoir (BELGIUM - Tags: POLITICS BUSINESS)