Wanting to stay in the Eurozone seems to depend on the availability of new loans. And really, Greece's EU partners are not willing to continue financing an unsustainable economic system. Inside or outside the Eurozone, Greece will have to make reforms. Tsipras wants to run a very expensive social system without a corresponding earning capacity. So unless Russia agrees to finance him permanently (like Cuba in the past), Tsipras will either have to spend less, start collecting taxes, or actually start making some money. Borrowing on the open market will cost 35% interest.