Ukrainians took to the streets twice in 10 years to defend their fledgling democracy. The first time, it seemed an election might be stolen. Then the government broke a pledge to bring the country closer to the European Union — and the people pushed back. Now Ukraine is mired in conflicts with separatists in the east and with Russia over its hold on Crimea. But even as Putin wages war on this former Soviet republic, the long-term outlook for Ukraine is strong. Harvard historian Serhii Plokhii explains why.