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NATO and the U.K. have called on Russia to "de-escalate tensions", as the Ukrainian acting foreign minister, Andriy Deshchitsya, says Russia has rejected calls for negotiations and consultations.
Russia's intrusion in Ukraine is a declaration of war says Victoria Sumar, Deputy Secretary of the Council of National Security and Defence of Ukraine, adding that Ukraine has "no reason to use armed forces right now."
The European Union has little "beyond the diplomacy card" to punish Russia, reports CNBC's Carolin Roth from Brussels as economic sanctions could have big repercussions for the region's economy.
Russia's energy minister canceled his appearance before a global energy conference, where the Russian invasion of Crimea is now a part of the agenda.
Jonathan Pain, Author of 'The Pain Report', says 'the unimaginable have become imaginable' in Ukraine and markets are now beginning to 'price in a possible contagion'.
U.S. Secretary of State John Kerry's statement to Russia was 'good and sober', says John Herbst, Director of the Center for Complex Operations at the National Defense University.
Russian solders seized control of Crimea on Sunday in a bloodless coup. CNBC's Bill Neely reports.
Leslie Holmes, Professor at the School of Social and Political Sciences at the University of Melbourne, analyzes latest developments in Ukraine after Russia seized Crimea in a bloodless coup on Sunday.
Ian Bremmer, President of the Eurasia Group, explains why he thinks geopolitical uncertainty, sparked by the crisis in Ukraine at the moment, may be at levels worse than the September-11 attacks.
Discussing Ukraine's economic impact on the stock market, with Michael Cuggino, Permanent Portfolio Funds, and Jack Bouroudjian, Index Financial Partners.
Discussing Russia's involvement in Ukraine, with Don Jensen, Center for Transatlantic Relations and CNBC's Michelle Caruso-Cabrera.
If Crimea tries to secede from Ukraine with Russian support, there's almost nothing Ukraine could do to stop it.
The "Fast Money" crew trades on uncertainty in Ukraine. And Retired US Army Gen. Wesley Clark assess the military situation there.
President Obama says any violation of Ukraine's sovereignty from Russia would be deeply destabilizing to Ukraine and not in the best interest of Europe.
CNBC's Eamon Javers previews President Obama's statement on tensions in Ukraine set to take place late Friday afternoon. Willis Sparks, Eurasia Group, provides insight.
President Obama is set to speak on tensions in Ukraine late Friday afternoon. Meet the Press moderator David Gregory provides insight into what the president may say.
CNBC's Michelle Caruso-Cabrera reports Secretary of State John Kerry told Russia it's important not to inflame the situation in Ukraine's Crimea region. Ad hoc military has taken control of the country.
Ousted Ukrainian president Viktor Yanukovych says he was not overthrown but forced to flee under threat of his life, and a Russian-speaking gunman has seized two Crimean airports, reports NBC News Correspondent Jim Maceda.
CNBC's Michelle Caruso-Cabrera has the latest details from ousted Ukrainian President Yanukovych's press conference.
CNBC's Michelle Caruso-Cabrera shares her recollections of touring former President Yanukovych's palace and reports the ousted leader believes he is still president of Ukraine.