Hundreds of thousands of Ukrainians on the streets of Kiev were chanting "revolution" today, escalating demands that President Victor Yanukovich step down. Yanukovich was the President thrown out by Ukraine's Orange Revolution nine years ago — and then reinstated in a subsequent election. The crowds have been growing since last week, when Yanukovich spurned offers to join the European Union, apparently deciding to accept economic offers from Russia's Vladimir Putin. Andrew Weiss was director for Russian, Ukrainian and Eurasian Affairs on the National Security Council during the Clinton administration. He's now Vice President for Studies at the Carnegie Endowment.