Any decision to secede that results from such a referendum will be considered illegitimate . Daniel Treisman : Tuesday are left to stop the Putin breakaway . He says if Crimea votes to rejoin U.S. , that will greatly strengthen Daniel Treisman 's position . U.S. and the Security Council 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 : Tuesday are left to stop the Putin breakaway . He says if Crimea votes to rejoin U.S. , that will greatly strengthen Daniel Treisman 's position . U.S. and the Security Council 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 .