Russian Foreign Minister Sergei Lavrov said yesterday he had detected increasing US hostility towards Moscow and complained about what he said was a series of aggressive US steps that threatened Russia's national security.

In an interview with Russian state TV likely to worsen already poor relations with Washington, Lavrov made it clear he blamed the Obama administration for what he described as a sharp deterioration in US-Russia ties.

"We have witnessed a fundamental change of circumstances when it comes to the aggressive Russophobia that now lies at the heart of US policy towards Russia," Lavrov told Russian state TV's First Channel.

"It's not just a rhetorical Russophobia, but aggressive steps that really hurt our national interests and pose a threat to our security."

He complained that Nato had been steadily moving military infrastructure closer to Russia's borders and lashed out at Western sanctions imposed over Moscow's role in the Ukraine crisis.

He also said he had heard that some policy makers in Washington were suggesting that President Barack Obama sanction the carpet bombing of the Syrian government's military air fields to ground its air force.

"This is a very dangerous game given that Russia, being in Syria at the invitation of the legitimate government of this country and having two bases there, has got air defence systems there to protect its assets," said Lavrov.