Greece's Prime Minister has warned international creditors not to impose humiliating terms on his country as it seeks urgently needed bailout funds. Alexis Tsipras said negotiations are at a critical stage, but that the lenders' proposals were not realistic. He was briefing Parliament amid growing opposition in his leftist Syriza party to the creditors' proposals.Earlier Greece delayed Friday's 300 million euro debt repayment to the IMF. Mr Tsipras described the EU-IMF lenders' plan as a bad moment for Europe and a bad negotiating trick.