The European Commission chief, Jean-Claude Juncker, has said he feels “betrayed” by the “egotism” showed by Greece in the failed debt talks.
Mr Juncker said he did everything to facilitate an agreement, but Greek proposals were “delayed” or “deliberately altered”.
He was speaking after the breakdown of talks on Friday sparked a weekend of dramatic developments.
Greece called a surprise referendum and Greek banks are closed for a week.
In a clear message to the Greek people, Juncker said “a no vote would look [like] Greece wants to distance istself from the Eurozone.
“No would mean … that Greece is saying ‘no’ to Europe.”