Kerry warned President Vladimir Putin that "he is not going have a Sochi G8, he may not even remain in the G8 if this continues. He may find himself with asset freezes, on Russian business, American business may pull back, there may be a further tumble of the ruble."
"There is a huge price to pay. The United States is united, Russia is isolated. That is not a position of strength," the top US diplomat told NBC's Meet the Press.
Ukraine's new interim government has called up all military reservists to stave off the threat and warned their country was on the brink of disaster.
"If Russia wants to be a G8 country, it needs to behave like a G8 country," Kerry also said on CBS's "Face the Nation" as he hit the Sunday morning talk shows, to ratchet up the pressure on Moscow.
"They're prepared to put sanctions in place, they're prepared to isolate Russia economically, the ruble is already going down.
