Greece faces a week of urgent diplomacy to free up bailout aid and avert a potential default as world leaders press for a final resolution to the standoff.
With talks between the Greek Government and creditors due to resume in Brussels today, Prime Minister Alexis Tsipras faced a united front from Group of Seven leaders calling for movement to end the impasse.
United States President Barack Obama put concerns over the deadlock on to the agenda of a G7 summit hosted by Chancellor Angela Merkel in southern Germany yesterday.
Canadian Prime Minister Stephen Harper "emphasised the importance of addressing the Greek debt crisis".
"There was unanimity of opinion in the room that it was important for Greece and their partners to chart a way forward that builds on crucial structural reforms", and returns to growth, said White House spokesman Josh Earnest.
The G-7 intervention raises pressure on both sides in the dispute to reach a compromise that unlocks the final 7.2 billion tranche of aid and brings Greece back from the edge of default, averting a possible exit from the 19-nation euro.