European Commission head Jean-Claude Juncker said that "challenging" negotiations with Greece would continue, after late-night talks with premier Alexis Tsipras broke up without a deal.
Finance ministers and central bank governors of the Group of Seven wealthiest nations gathered in Dresden to discuss the global economy and tax evasion.
The International Monetary Fund said that Greece may need debt relief but rejected news reports that it had pushed for it at a eurozone meeting last month.
Greek Finance Minister Yanis Varoufakis insisted in a German newspaper interview that he is still in charge of Greece's team handling crucial talks with creditors.
Greece's president said he hoped to meet his German counterpart soon for talks on Athens' demands for reparations over the Nazi occupation of Greece during World War II.
The euro fell against the dollar as Greece ordered all public agencies to pony up their financial reserves to help the debt-riddled government meet urgent payments.
US President Barack Obama and Greek Finance Minister Yanis Varoufakis had a "brief interaction," after the finance chief caused a stir by saying he would meet with the US leader.
Greece has agreed to repay its debt to the International Monetary Fund by April 9, IMF chief Christine Lagarde said after a meeting with Greek Finance Minister.