steven cohen does not agree. he's a professor emeritus at nyu and princeton university and authority of "soviet fates and lost alternatives." he says putin did not create the ukrainian crisis it was imposed on him. he joins us along with jill dougherty. what do you mean by that, that vladamir putin believes this was imposed upon him? >> he looked at what was happening in ukraine beginning in november, he looked at what was happening in kiev and saw nato coming at him again. why he saw that we need to roll back to the 1990s. it's been american policy, the policy of the democratic and republican party, to move western power, spearheaded by nato, from berlin to russia's borders. it is on russia's borders in the baltic, it's at poland. so stop and think for a minute what we have now. we have moved. we, all of us have moved the old