Tension and fears are mounting
And here are some other pieces that break down what is happening:
At the 2008 NATO summit in Bucharest, Romania, Vladimir Putin told a surprised George W. Bush, "You have to understand, George, that Ukraine is not even a country. Part of its territory is in Eastern Europe and the greater part was given to us."
Six years later, the Kremlin appears to be making sure that Putin's opinion becomes a reality. More.
The standoff in Ukraine's Crimea region is a strange one, where soldiers appear to be standing around amid an air of calm. They wear no military insignia, but there's little doubt about who they are.
Russian forces "have complete operational control of the Crimean peninsula," a senior U.S. administration official told CNN, with estimates of 6,000 Russian ground and naval forces in the region. A law is being considered in the Russian parliament that would allow Crimea to be annexed, according to the parliament's website.