Russian President Dmitry Medvedev has rebuked US presidential hopeful Mitt Romney for saying Russia is the "number one geopolitical foe" of the US.
Mr Romney made the comments while criticising President Barack Obama for appearing to suggest a future deal with Russia on the issue of missile defence.
Mr Medvedev said Mr Romney's comments "smelled of Hollywood" and advised him to "use his head".
Moscow has long opposed US plans for a missile defence system in Europe.
In remarks caught by TV cameras on Monday during a summit in Seoul, Mr Obama had appeared to suggest to Mr Medvedev that he would have more "flexibility" on difficult issues such as missile defence after November's US presidential election.
In an interview with CNN, Mr Romney had called Mr Obama's remarks "alarming" and "troubling".
"If he's planning on doing more and suggests to Russia that he has things he's willing to do with them, he's not willing to tell the American people - this is to Russia, this is, without question, our number one geopolitical foe," Mr Romney said.
In response, Mr Medvedev said: "I recommend that all US presidential candidates... do at least two things: that they use their head and consult their reason when they formulate their positions, and that they check the time - it is now 2012, not the mid-1970s."
Read more at the BBC...