Actually, it isn't. The USA spent $5 billion - quite openly - to foment a coup d'etat which overthrew the democratically elected government of Ukraine and replaced with an unelected bunch of foaming fascist killers. This was probably intended to provoke the Russians into invading to protect their people. That was never going to work, though; the Russians are famous for chess skill, and they more or less pioneered the art of "maskirovka" - the misleading feint, followed by an unexpected blow elsewhere. They were hardly going to fall into such an obvious bear trap.
What's more, economically and politically it would be very unfavourable for Russia to get involved in Ukraine - let alone invade or take over. Ukraine is a relatively poor nation these days, and Russia would just acquire a lot of headaches and liabilities - not to mention precipitating an extremely dangerous military confrontation with NATO.
The Russians' best course, as I am sure they are aware, is to stand back and watch Obama and his minions play their silly games. Meanwhile, they can sell their oil and gas to China and other Asian nations, and talk quietly to China, Pakistan, Iran and other countries actively threatened by US aggression. And one of these days, they will all stop using the dollar.