mad bad vlad

i am interested and very worried on what is going in in ukraine and where it will take the world . i am a bit concerned in the main player in this putin .i can understand he does not like the idea of nato in ukraine and on his door step . but why the cold war ended in 1991 so why does putin hate and mistrust the west and there intentions . nobody has twisted ukraine arm to join nato . basically they are doing it as they do not feel safe with the bullying coming from putin . it is time putin accepts much as he hates the idea the old soviet empire has be put into history books . never a step back to the cold war mistrust and arms race between east and west