Greece's finance minister, Evangelos Venizelos, said negotiations for the bailout deal his country needs to avoid defaulting on its debts must be conclude by late Sunday, but that a breakthrough is being held up by demands from debt inspectors for more austerity measures.The finance minister said the negotiations in Athens with rescue creditors for a new (EURO) 130 billion ($171 billion) baillout deal are in a very "crucial stage."