Russia expressed outrage over a "frenzied anti-Russian campaign" by U.S. media and political analysts, stepping up a war of words that has intensified during the Ukraine crisis.

Ties between Moscow and Washington have sunk to their lowest level since the Cold War over the crisis in Ukraine, and each side has accused the other of waging an information war.

The Russian Foreign Ministry said "propagandists" working on orders from Washington were producing "Russophobic lampoons, carefully building an image of Russia as an enemy, instilling hatred of anything Russian in ordinary people."