Moody's Investors Service on Monday changed its ratings outlook to negative for Aaa-rated Germany, the Netherlands and Luxembourg, citing uncertainty about the euro zone's ongoing debt crisis.
The outlook for all three top-rated countries had previously been stable. Moody's also affirmed Finland's top Aaa rating and its stable outlook.
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The ratings agency said it saw an increased chance that troubled euro zone countries such as Spain and Italy would need more support, the burden of which would fall on the highest-rated states.