The purpose for founding NATO after WWII was necessary for peace. But in recent years it has expanded it’s agenda to include enlarging by taking in more countries, being involved in hostilities in Afghanistan, flexing its muscles in Africa, and has become more like a warlord. The NATO founders surely are rolling over in their graves.
NATO did not force nations to join it. Nations wanted to join NATO because they want to be safe from Russia. Russia’s former subjects did not suddenly forget the last hundred years or ignore what Russia was doing in Chechnya, Georgia, and now Ukraine. Getting in way of Russia’s ambitions is not threatening Russia in anyway. Unless Russia’s ambitions are the threat to her neighbors first.