Greece's new anti-austerity government will put before parliament early next week its first legislation tackling the "humanitarian crisis" caused by years of cuts.
Germany rejected a take-it or leave-it request by Athens for a six-month extension to its EU loan programme.
Prokopis Pavlopoulos, who was elected Greece's new president, is a veteran conservative insider whose selection has raised its share of eyebrows among the ruling left.
Greece was expected to bid for extra debt crisis aid from the EU without strings attached, ahead of a closely-watched ECB meeting on the country's emergency funds.
Eurozone ministers have handed Greece an ultimatum to request an extension to its bailout programme after crunch talks collapsed.
Greece goes into talks with its eurozone partners demanding changes to a massive international bailout.
Greek Prime Minister Alexis Tsipras warned that his government would not be pressured into breaking promises made to voters.
Greece's foreign minister said his left-wing government wants to resolve the nation's debt squeeze with Europe.
Greece's radical new government was fine-turning details of a controversial reform deal it hopes to seal with sceptical EU creditors at critical talks.
A defiant Prime Minister Alexis Tsipras said he would be "unshakeable" in carrying out the new Greek government's anti-austerity agenda.
Moody's placed Greece's credit rating on review for a downgrade Friday, citing "high uncertainty" about the country's talks with creditors.
Greece's finance minister faced criticism and a stern reminder of his commitments to his EU partners.
Greece's new government remains committed to its NATO role despite close ties with Russia that have worried its allies.
Italian Prime Minister Matteo Renzi said he believes Greece will be able to strike a deal with its EU partners over its massive debts.
European Commission chief Jean-Claude Juncker warned Greece's new government that Brussels will not change all of its rules just to solve the debt crisis in Athens.
Greece will not deliver a strong economic recovery unless authorities loosen austerity programs, US President Barack Obama suggested in remarks that aired.
Greek Finance Minister Yanis Varoufakis said he wanted to reach a new agreement with international creditors on his country's debt burden "by the end of May".
The European Union must halt "spasmodic" action against Russia, adding Greece could not be ignored in EU affairs simply because it owes money.
German Chancellor rejected the prospect of debt relief for Athens, adding to tensions between the radical new Greek government and its international creditors.
Greece's new radical Prime Minister Alexis Tsipras will travel to Italy and France next week for meetings.