Andrew Foxall, director of the Russia studies center at The Henry Jackson Society, says the Crimean referendum could be seen as "hugely significant" because of what it reveals about Putin's nature.
Russia is not only interested in Crimea but the whole of Ukraine, says Ukrainian presidential candidate Vitali Klitschko, but adds that the country is "ready to defend" itself.
Veteran trader Art Cashin told CNBC on Monday that a rumor about a second corporate bond default in China has been making the rounds on Wall Street.
CNBC's Steve Sedgwick spoke with Ukrainian Prime Minister Arseniy Yatsenyuk about defending the country's sovereignty.
CNBC's Eamon Javers reacts to President Obama's move to authorize a "very tough" set of sanctions on Russia.
President Barack Obama announces a series of sanctions against Russia and warned of further measures. Obama said, "Ukraine's sovereignty and territorial integrity must be respected and international law must be upheld."
Discussing what Ukraine means for global markets, with CNBC's Michelle Caruso-Cabrera.
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.
Where the markets will trade when the Fed begins to "normalize" policy, with Barry Knapp, Barclays head of U.S. portfolio strategy; Ed Keon, Quantitative Management Association; and Morgan Stanley Wealth Management Vice Chair Gary Kaminsky.
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.
Discussing the impact of geopolitical concerns on the U.S. economy, and the Federal Reserve's monetary policies, with Morgan Stanley Wealth Management Vice Chair Gary Kaminsky, and Standard and Poor's chief global economist Paul Sheard.
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.
Janet Yellen takes center stage in the week ahead, chairing her first FOMC meeting amid market skittishness over events in Ukraine.