How ironic. NATO only expands when countries feel threatened enough that they want the security of a mutual defence treaty with several other liberal democracies... Maybe if Russia stopped treating all their neighbours like scum, their neighbours would stop applying to join NATO.
Well, I have to start off by admitting that I'm no Russia expert, so hands-up to that failing on my part. I also completely accept that Putin is some sort of a megalomaniac basket case, but I do genuinely think that Russians generally have a feeling that western Europe is a threat. This view was fuelled by the German invasion of WW2, when Russia probably suffered more casualties than all other countries put together, and maybe dating right back to Napoleon's march on Moscow. NATO to them isn't the defensive, weakish, set-up we all know it to be, but an alliance of many countries, never friends to Russia, and run by the USA, Russia's arch enemy. After WW2, Russia created a buffer of Balkan and other countries between itself and the threat of the West, and this has been worn away over time, and in many cases become part of the NATO 'threat'. Dunno if Putin is exploiting this feeling among average Russian folk, or is demented enough to believe it, but that's where I think the present problem originates, anyway.