Time was running out to get a desperately needed debt agreement in place after 10 hours of talks in Brussels, with Greece's economy and banking system at risk of imminent collapse.
Ukrainian President Petro Poroshenko said that his French counterpart Francois Hollande and German Chancellor Angel Merkel had pressed him to ensure partial self-rule for the pro-Russian separatist east.
The International Monetary Fund said that allowing a borrower to delay repayment, as Greece has requested, is generally ineffective in helping a country overcome crisis.
Irish Prime Minister Enda Kenny said that Greece can still return to negotiations with its international creditors to avert a default and possible exit from the euro.
Russian Foreign Minister Sergei Lavrov expressed the hope that Brussels would avoid "negative scenarios" over Greece amid fears that the country is heading for a eurozone exit.
Japanese Prime Minister Shinzo Abe called on Russian President Vladimir Putin to play a constructive role in finding "peaceful and diplomatic solutions" to the crisis in Ukraine.
The Russia-Ukraine conflict has no short term solution and is part of a fabricated conflict with the West to distract everyday Russians from corruption and incompetence.
The leaders of Germany and the United States hammered home a tough line on Russia as they kicked off a G7 summit dominated by crises in Ukraine and Greece.
US President Barack Obama and German Chancellor Angela Merkel said that Western sanctions must remain in place against Russia until it complies with a ceasefire deal with Ukraine.
Ukrainian President Petro Poroshenko warned of a "colossal threat" of renewed fighting with pro-Russian rebels after a surge in violence that left at least 26 people dead.
The Kremlin accused Ukrainian forces of "provocative actions" as fresh clashes flared in east Ukraine after Kiev said pro-Moscow rebels had launched a new assault.
A Russian freelance journalist who claims she went undercover as a pro-government Internet troll says she is suing her former employer in a bid to expose the workings of the Kremlin's online army.