Mr. Assange did not apply for such a visa at any time or author the document. The source is document fabricator & paid FBI informant Sigurdur Thordarson who was sentenced to prison for fabricating docs impersonating Assange, multiple frauds & pedophilllia.
I wouldn't care if Assange had sought a visa to travel to Russia. If the US neocons were to try to lock up every American who's received a travel visa to Russia, there'd be a violent revolution if needs be and all those neocons would lose their heads, so to speak, maybe literally. People do get fed up. Neocons are always too stupid to back off and shut up, though.