USA seems to be doing maximum effort as possible to not get involved in a military conflict against Russia. Biden is speaking right now and although he condemns Putin for the invasion, he hasn't ordered any military aid to Ukraine, neither any other allied countries did. All the measures adopted by US are related to economical sanctions to make Russia "bleed" internally along the time. It's a risky strategy though, because Russia can still count on with a powerful ally that is China. Moreover, if Putin feels there wasn't any considerable resistance when invading Ukraine, nothing will stop him from continue conquering new territories towards central Europe.

The point ignored by the occident is that Kiev is 96 hours from being taken by russian forces and sanctions won't be enough to prevent Ukraine from being conquered by russians on short run.