Greece cannot rely on the European Central Bank to raise a limit on Athens’ issuance of short-term debt, ECB President Mario Draghi suggested on Thursday. He also said the rules meant the ECB could not buy Greek bonds under its new asset-buying program. Asked about the short-term debt limit at a news conference following the ECB’s meeting in Cyprus, Draghi said that the bank was prohibited by European rules from direct or indirect financing of governments. “The ECB is a rule-based institution.