The term slow torture is interesting. Eurozone "partners" indeed pressure Greece government to act against its own national interests.
The primary tool so far has been BCE supply of money to Greece's banks. While this mechanism has nothing to do with sovereign debt, it has been used as blackmail: "act as we ask, otherwise your banking system will collapse because of liquidity shortage".
The reforms they were not asked to perform are interesting. Greece has been asked to reduce salaries and pensions, and even to sell some territory. But when did EU "partners" did push for a tax reform so that the wealthier pay their share? When did EU "partners" asked for military budget reduction? When you have trouble paying debts, it sounds strange to let wealthy people's money leaking into fiscal paradises, and to buy submarines from Germany.