Has the United States been more accepting of Bitcoin than Russia? That's the idea I get and it's surprising.
Even though the US is in the hand of banksters the USD is still the reserve currency and has all to gain from being exchangeable for as many things as possible including other currencies such as euros, bitcoins, rubbles, oil, drugs, large laundered assets and dictator accounts*. Until bitcoin becomes much, much larger, there is no actual incentive form the point of view of the USD to fight it. Maybe that's a reason.
The rubble is a whole different game.
*http://www.zerohedge.com/news/2014-02-26/presenting-1-financial-haven-dictators-criminals