Crimea voted to secede from Ukraine and join Russia, a move declared illegal by western leaders, reports NBC's Ian Williams.
Obama's executive order issued Monday names seven Russian government officials, after Crimea's vote to secede from Ukraine.
President Obama has signed a new executive order expanding on sanctions imposed in an executive order less than two weeks ago. The White House will block the assets of certain Russian officials, as well as a travel ban.
CNBC's Steve Sedgwick reports on comments made by Ukrainian member of Parliament Vitali Klitschko about whether the Russians have what they want from Ukraine.
CNBC's Steve Sedgwick reports on the concerns in Ukraine after Crimea voted to join Russia.
A Kremlin-backed journalist issued a warning to the U.S. about Moscow's nuclear capabilities.
CNBC's Michelle Caruso-Cabrera reports Russian broadcaster Dmitry K. Kiselyov stunned viewers on comments made about Russia's power.
CNBC's Steve Sedgwick speaks to former Ukrainian Foreign Minister and current Ukrainian member of Parliament Petro Poroshenko about Russia's interest in Crimea. It will be announced next week whether Poroshenko is up for election to be Ukraine's next president.
The EU will "have to stick to its guns" regarding Russian sanctions following the "illegal" referendum in Crimea, says Radek Sikorski, Polish foreign minister.
CNBC's Michelle Caruso-Cabrera provides insight into the Crimeans' referendum vote to leave Ukraine and join Russia, and the current condition of the Russian market.
Dr. Leon Aron, American Enterprise Institute director of Russian studies, thinks the United States will impose sanctions on Russia in conjunction with the European Union as early as Monday morning.
The EU is to discuss possible sanctions against Russian officials, who are behind the country's "illegal" decisions and actions in Ukraine says Linas Linkevicius, Lithuanian foreign minister.
Lilit Gevorgyan, CIS analyst at IHS Global Insight, discusses Russia following the Crimean referendum to join the country and how increased tensions between Russia and the West could impact investments.
Tina Fordham, senior global political analyst at Citi, highlights Russia currently has "no legal mechanism" in place to absorb Crimea and that the status the region would have remains undetermined.
Illinois senator Dick Durbin says Russian president Vladimir Putin uses natural gas as a bargaining tool in political affairs.
Ukrainian foreign minister Andrii Deshchytsa, says Ukraine and its allies can convince Russia to stop short of military conflict.
U.S. senator John McCain dubs the Crimea referendum a "sick joke" and says the international community is eying "tough sanctions" against Russia.
CNBC's Steve Sedgwick reports on the referendum in Crimea in which the region voted overwhelmingly to join Russia.
Marko Pavlyshyn, Director at Mykola Zerov Centre for Ukrainian Studies at Monash University, says Sunday's referendum in Crimea is the prelude to further destabilization in Ukraine.
Roger Groebli, CEO of Reyl Overseas, discusses recent volatility in global financial markets and ongoing instability in Ukraine.