Greek vote will test Spains new banking firewall.

Spain joins calls for increased efforts to aid European banks.

Spain joins calls for increased efforts to aid European banks.

Currency hits 3-month low as central bankers discuss possibility of Greek departure.

Currency hits 3-month low as central bankers discuss possibility of Greek departure.

Spanish protests, French candidates push back against focus on deficit reduction.

Spanish protests, French candidates push back against focus on deficit reduction.

Leaders look for IMF assistance as concerns about Spain mount.