Greece is already talking pretty tough. They have a potential ally in Putin, who covets their coast and probably wants to ink an agreement to operate some sort of a base there. The EU had better play this game carefully and not let their ego get in their way. The talking I've heard so far is little more than veiled threats of being locked out of the bond market, no liquidity and so on. Russia and China could fill in that gap without breaking a sweat, and they are patiently waiting to do just that.