Vladimir Putin is the central figure in the Ukraine crisis. But what really drives the Russian president? Journalist Adi Ignatius has some ideas. He met Putin when Time Magazine named the Russian leader "Person of the Year" in 2007.
Between Ukraine and the Republic of Moldova lies the breakaway region known as Transnistria. The region is made up of a majority of ethnic Russians, and many want to be part of Russia. So why not, after Crimea?
President Obama in Europe this week has been rallying the nations of Europe to oppose Moscow's annexation of Crimea, and to try to deter further aggression. But despite all the talk of unity, there are serious limits to what the US and Europe are willing to do together. Host Marco Werman speaks with Judy Dempsey, senior associate at Carnegie-Europe.
Historian Margaret MacMillan sees parallels between the lead-up to World War I and today's instability in the face of rising Russian nationalism. She says the West failed to appreciate Russia's feeling of humiliation after the Cold War. She warns against dangerous miscalculations and for a strong response to Putin.
Last week, Toronto Star reporter Mitch Potter was approached by a group of angry Pro-Russia separatists in the eastern Ukraine town of Slovyansk. He thought he was going to be kidnapped as a foreign journalist. Then, he spoke French.
A new round of US sanctions against Russia is taking aim at several members of Vladimir Putin's inner circle. One of them is Igor Sechin, considered the Russian energy czar and a close adviser to Putin.
Ukraine's military is starting to fight the masked, pro-Russia separatists in eastern Ukraine who have been taking over government buildings. As fears of civil war grow, there's another sign that the conflict is escalating. New, masked militias with a pro-Ukraine agenda are now training to counter the separatists.
Ukrainian forces scored major tactical victories this weekend against pro-Russian rebels. Ukraine's military appears to be gaining the upper hand against the separatists, according to a BBC reporter, who suspects the end result of the conflict will be a more nationalist and anti-Russian Ukraine.