Events are unfolding at a furious pace in Ukraine. I decided not to blog about them last night, because I knew that whatever I wrote would be superseded within minutes, and that was definitely the case. The same is probably true now, but enough has transpired to justify some comment. Yesterday saw the negotiation of a deal between the opposition leadership and Yanukovych in which the president made major concessions, including a return to the 2004 constitution (with much more limited presidential powers), the resignation of the interior minister, and the creation of an independent investigation overseen by the EU....