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¿Cómo traduciriáis "two-tier Europe" en el siguiente contexto?

Demanding tougher austerity conditions from countries such as Spain and Italy, however, would reinforce the division in the eurozone between debtors and creditors: “It is a step towards making a two-tier Europe permanent.”
Mr Soros, 82, will spell out his fears that such a split would lead to the eventual collapse of the currency union – and of the common market and the European Union as a whole – in a speech on Monday night in Berlin. He has also published a lengthy essay on the “tragedy” of Europe in the latest New York Review of Books.