Congress passed a resolution condemning Russia's intervention. "This is is a huge shift in the US-Russia policy," Rep. Mike Turner, (R) Ohio.
The CIA Is watching the situation. "Our responsibility really is to identify sort of what are the options available what are the likely scenarios," said John Brennan, CIA Director.
There are signs that the standoff could dissolve.
Crimea's parliament announced that if voters on Sunday decide to break away, the region would first declare itself independent -- not immediately part of Russia.
Ousted Ukrainian President Viktor Yanukovich called the vote illegitimate.
And in a phone call to Russia's foreign minister, Secretary of State John Kerry again gave Russia a way out, with a warning: "We respect the fact that Russia has interests, particularly in Crimea, but those interests in no way justify military intervention or the use of force," said State Department Spokeswoman Jen Psaki.
For now, Russia has taken over most of Crimea's military bases.
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