The ECB is quoted by Bloomberg:
“The ECB today decided to lift the waiver affecting marketable debt instruments issued or fully guaranteed by the Hellenic Republic.The Greek government is spinning the line that the ECB action puts pressure on the Eurogroup to quickly strike "a mutually beneficial deal".
The Governing Council decision is based on the fact that it is currently not possible to assume a successful conclusion of the program review and is in line with existing Eurosystem rules.”
This is either naive, or disingenuous. The ECB action is designed solely to pressure Greece to decide as to whether it wishes to honour its debts or leave the Euro.