Italy's Prime Minister Mario Monti criticized an “inappropriate” declaration by a Nordic country on the euro, saying it has contributed to driving up bond yields in some countries, Bloomberg said.

Refraining from referring to Finland directly, Monti said that individual member states shouldn’t damage the credibility of decisions made collectively at the European level.

“The increase in spread linked to several factors, including the declaration, which I personally consider inappropriate from such and such a Nordic state, that has the effect of reducing the credibility that the European Council decided unanimously,” he told journalists, Bloomberg said. “We don’t undo unilaterally what we laboriously put together collectively.”