Russia and surrounding states had lost around 25 million people in the second world war, when the Nazis on their borders, broke the diplomatic treaty they had with the USSR, and tried to wipe out the remaining people. Soviet appeasement and diplomacy did not work with the Nazis to their peril.
NATO, which saw the U.S.S.R as its main foe, should have been dismantled after the collapse of the U.S.S.R, and the embracing of democracy by the eastern bloc.
However NATO, started projecting Russia as a bogeyman out of past habit, and probably to keep swindling gullible taxpayers of their money. Continued attempts by NATO to encroach into border states of Russia heightened Russian insecurities in this regard, still kept raw by the memories of the destruction caused by the Nazis, and which is remembered every year on Victory Day (May 9).
NATO wants the border states of Russia in its membership. Obviously this is interpreted as a threatening gesture , which has played havoc with growth of democratic institutions in Russia , as Putin uses these sorts of external threats and paranoia of invasion to consolidate his grip on the Russian government through hypernationalist propaganda.
NATO seems to be keen on getting Ukraine as a NATO member. Why can't it get Russia as well as a NATO member, and give it a privileged status on accordance with its technological and military capabilities !!! This would give Russia and Russians a sense of security, and would have avoided all these issues that had cropped up after Ukraine showed inclination to join NATO.
But of course, if Russia becomes a NATO member, then there would be no bogeyman to be scared off, and there would be no need to spend so much money on NATO operations, and that would be a major tragedy for the military-industrial complex and corporates that need the money to finance their lavish lifestyle.