The banks won't be able to reopen on Tuesday as scheduled unless the ECB resumes emergency lending -- and that appears unthinkable without an unequivocal commitment from the Greek government to reform.
Some essential services are starting to feel the pinch, too.
Dr. Theo Giannaros, head of the Elpis hospital in Athens, told CNN that supplies of medicines and basic foodstuffs were running low.
The prospect of a failing state in southeastern Europe
alarms policymakers from Brussels to Washington. Greece is a member of NATO, but has been flirting with Russia. And it is the gateway to Europe for many migrants fleeing war, terror and poverty in the Middle East and Africa.