Putin will look silly by banning McCain and Durbin tomorrow, bringing the USA closer together.
McCain is valuable, giving Obama a defense if he needs to up his own threats.
Kissinger has been an interesting read on this also.
I prefer 'No Drama Obama' saying "other" options, versus "military" options as with McCain.
It will take the USA/EU more time to prepare for Puting cutting off his oil and natural gas, if he threatens to.