and the problem is russia hasn t really abided by any of those agreements in the years since they were first reached after the annexation of crimea in 2014. do we know what putin s end game here. what does he want? reporter: that is a great question, alisyn. one part is making sure that ukraine does not join nato but he wants to reverse ukraine s move toward the west. and he may well, and on this issue american intelligence officials and administration officials are divided, he may well see this as his moment to begin to reconstitute elements of the soviet union. he said the break up of the soviet yunon was the great tragedy of the 20th century and now he has belarus moving slowly back into his orbit and i think