A couple of weeks ago, the idea of a military intervention in Ukraine seemed unthinkable. But the arrival of Russian troops in Crimea has shown the world that the Russian president is willing to embark on reckless adventures on the EU's doorstep. How should the EU respond to Vladimir Putin's new confrontational style? Is this a new Cold War?
British MEP, European Conservatives and Reformists
Polish MEP, Socialists and Democrats
Latvian MEP, Group of the Greens
Editor, European Voice