The Greek Prime Minster's been given a week to row back on his demands or see his country face financial ruin.
Greece is seeking a cash-for-reform deal, to avoid defaulting on a 1.5 billion euro debt repayment to the IMF.
Alexis Tsipras was given the warning by international creditors as the IMF's delegation returned to Washington from Brussels yesterday.
Economist Colm McCarthy says the effect of a Greek exit from the Eurozone should not be underestimated:
