Alexis Tsipras, the Greek prime minister, asked to meet Jean-Claude Juncker on Saturday but was spurned by the European Commission president rankled by the Greek leader's denunciation of his efforts to broker a bailout deal.
Mr Tsipras met with Mr Juncker in Brussels on Wednesday to discuss a compromise agreement hammered out by the European Commission chief and the leaders of Greece's other two creditors, the International Monetary Fund and the European Central Bank.
At the time, Mr Tsipras said "progress was made" at the Brussels meeting with Mr Juncker. But in a fiery speech before the Greek parliament Friday night, Mr Tsipras lashed out, saying he was "unpleasantly surprised" by the offer made by Mr Juncker, calling the proposals "absurd" and "irrational, blackmailing demands".
"I would like to believe that this proposal was an unfortunate moment for Europe, or at least a bad negotiating trick, and will very soon be withdrawn by the same people who thought it up," Mr Tsipras told the Greek parliament.
According to a senior official with a Group of Seven delegation, which began gathering in southern Germany on Saturday ahead of a two-day summit of the leaders of the seven leading industrialised powers that begins Sunday, Mr Juncker believed Mr Tsipras' speech in parliament left little to discuss.
"Unless he seriously addresses the issues, there's no reason to meet," said the G7 official.