President Putin thinks most of the rest of the world is against him - but that's hardly surprising given he is one of an unholy, loose alliance of tyrants and megalomaniacs who despise "the West" anyway on ideological grounds.
The Russian president is a threat to the USA but not very closely. His government is already attacking Western Europe physically by sabotage, arson, etc., but its largest weapon is via the Internet, as it can be aimed relatively stealthily against almost anyone, including the USA.
Vladimir Putin for his part thinks the USA and more, most of Europe a threat to him. More accutately a threat to his imperialist ambitions: he resents the loss of the Soviet empire. If he thinks any one country is against him though - apart of course from Ukraine he believes should not exist - it is not the USA but the UK.
Russia is not a threat to the USA: its president and his clique are the threat.
