Adm. James Stavridis added that serious financial sanctions on Russia should also be considered.
A Yanukovych ally, Dmitry Firtash, was arrested Thursday in Austria at the request of the US. But corrupt and powerful oligarchs can be found in all camps.
Crimea cancels flights as pro-Russian forces tighten their grip ahead of Sunday's referendum on whether to secede from Ukraine, whose interim prime minister is due to meet President Obama today.
And the US knew that Russia was laying the ground to make a move on the strategically useful peninsula. Doing something about it is another matter.
Money will certainly be forthcoming for Ukraine. Whether it will come soon enough and in large enough quantities is another matter.