Daniel Treisman : Only a few days are left to stop the Crimea breakaway . The US and EU have been trying for years to get Russia into their sphere of influence, but Putin has always refused. First , all the European Union states plus the United States should make absolutely clear that they will not recognize the results of a referendum held while armed bands of `` self-defense forces '' roam Crimea . U.S. and EU need to apply economic pressure , make the case for a `` no '' vote , he says . Treisman : Crimea must see the choice is between prosperity and stagnation .
Daniel Treisman : Only a few days are left to stop the Crimea breakaway . The US and EU have been trying for years to get Russia into their sphere of influence, but Putin has always refused. U.S. and EU need to apply economic pressure , make the case for a `` no '' vote , he says . Treisman : Crimea must see the choice is between prosperity and stagnation .