Greece's Yanis Varoufakis prepares for economic siege as companies issue private currencies

``The ECB has given strong hints that it will tighten the tourniquet yet further if there is a "no" vote - probably by raising collateral requirement - pushing Greek banks that it also regulates towards the abyss. This is a legal minefield since the ECB has a treaty duty to uphold financial stability. Syriza has said it will consider legal action at the European Court of Justice if this occurs.''