BBC: Russia's threat to aim weapons at Europe if the US sets up a missile defence shield there was "unhelpful and unwelcome", Nato has said.
The US says it wants missile defence in eastern Europe to counter threats from states like Iran and North Korea.
On Sunday, Russian President Vladimir Putin said Iran was not a threat to the US, hinting that Russia was the target.
French President Nicolas Sarkozy has said he will have "frank" talks with Mr Putin this week about the threat. Nato condemns Putin missile vow (more)
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Putin launches missile row
Mark Alexander
