Re: "Putin may not be insane"
All this talk of a defensive military alliance, which has been in existence since the end of WW2 and hasn't attacked or invaded anyone*, being hostile.
Someone has been drinking Putin's Kool-aid. Careful there's no polonium in it.
*Unless you count their intervention in Serbia in 1994. This was precipitated by the "ethnic cleansing" (genocide) of ethnic Albanians by a whole load of unpleasant fellows who were later tried and found guilty of war crimes. Nobody annexed their territory under the pretext of "this used to belong to us", like Putin is trying to do, either.
Read up on the confilct if you want to know more about why NATO forces intervened. Not many would argue that the decision was incorrect.