That Friday has come and gone and the talks over Greece are still going on, with creditors disowning proposals they had agreed to just two days before, is not a hopeful sign for the future of the euro. Banks with a major international presence in the euro zone will have to be working on their survival strategies. Within Greece, capital control rules could follow as soon as Monday. The effective deadline for the Greece talks is said to be late Saturday night, but possibly that could stretch into Sunday. Sunday night would risk being too late for all the procedural steps that have to follow by Tuesday. It may be too late already. If the latter deadline is missed, there is no turning back.