The only illogic is that is not having Russia to a similar degree while doing so. The point of the sanctions is to give an extra cost to their ambitions and limit the growth in power of the targetted entries.
Why Russia's ambitions are less legitimate than American ones?
The US is not morally or legally obligated to support or enable Russian ambitions and has the right, as a sovereign nation, to react to actions against their interest.
What exactly is their interest in Crimea on the other side of the globe?
a large part of the Russian community in Crimea supported the annexation.