Greece’s government can make no more concessions in negotiations for a cash-for-reforms deal and its international lenders must take responsibility for their role in the talks, Labour Minister Panos Skourletis said on Tuesday. Athens and its creditors from Europe and the International Monetary Fund are racing to prevent the country from defaulting on its debt and potentially leaving the euro zone. An EU official said any offer from Greece’s creditors to Athens would not be framed as an ultimatum.