Live Blog: Ukraine On The Brink

Speaking on a Sunday morning television talk show in the United States, he also threatened "very serious repercussions" from the United States and other countries including sanctions to isolate Russia economically.

Kerry, appearing on the CBS network's program "Face the Nation,' raised the possibility of boycotting the June meeting of the Group of Eight leading industrialized countries in Sochi, Russia.

He's also discussed visa bans, asset freezes, and trade and investment penalties.

He said he had spoken with foreign ministers for G-8 and other nations on Saturday, and says everyone is prepared 'to go to the hilt" to isolate Russia.

"●Imposing sanctions against Russian state-owned banks and financial institutions;

●Widening application of the 2012 Sergei Magnitsky Rule of Law Accountability Act against an array of Kremlin officials, including Putin;

●Terminating all negotiations with Russia on a possible trade agreement or promoting business;

●Calling an emergency NATO meeting to reassure NATO allies that border Ukraine and initiate mobilization of forces to be ready for any developments (Article 4 of the NATO Treaty, invoked by Latvia and Lithuania, calls for consultations about security concerns);

●Sending U.S. military ships to the Black Sea for any contingencies;

●Pushing for a U.N. Security Council resolution condemning Russia’s aggression against its neighbor, even though Russia will obviously veto it; and

●Joining other Group of Eight members in expelling Russia and announcing the cancellation of Obama’s plans to visit Sochi, where Putin was to host this year’s G-8 meeting in June."

"It's really 19th-century behavior in the 21st century and there is no way -- to start with -- if Russia persists in this that G8 countries are going to assemble in Sochi. That's a starter. But there is much more than that. Russia has major investment and trade needs and desires. I think there is a unified view by all of the foreign ministers I talked with yesterday -- all of the G8 and more -- that they are simply going to isolate Russia, that they are not going to engage with Russia in a normal business-as-usual manner."

"Russia is inviting probrium on the international stage. There could even be -- ultimately -- asset freezes, visa bans, there could be certainly disruption of any of the normal trade routine, there could be business draw-back on investment in the country. The ruble is already going down in feeling the impact of this."

"[Vladimir Putin] is not going to gain by this. You know, he may be able to have his troops for some period of time in the Crimea unless he resolves this, but the fact is, he is going to lose on the international stage; Russia is going to lose, Russian people are going to lose; he is going to lose all of the glow that came out of the Olympics -- his $60 billion extravaganza -- he is not going to have a Sochi G8. He may not even remain in the G8 if this continues."