A Kremlin-backed journalist issued a stark warning to the United States about Moscow's nuclear capabilities on Sunday as the White House threatened sanctions over Crimea's referendum on union with Russia.
"Russia is the only country in the world that is realistically capable of turning the United States into radioactive ash," television presenter Dmitry Kiselyov said on his weekly current affairs show.
Behind him was a backdrop of a mushroom cloud following a nuclear blast.
(Read more: Latest developments in Crimea crisis)
Kiselyov was named by President Vladimir Putin in December as the head of a new state news agency whose task will be to portray Russia in the best possible light.