Ever stop to wonder what triggered the change in Russia's force posture?
https://www.newscientist.com/article/dn11014-us-anti-missile...
In the early 2000s they were entirely focused on counter-insurgency in the Caucasus. They had restructured their military to be brigade-based, so they could deploy small formations easily. What convinced Russia to re-focus on larger, nation-state threats in their near abroad? There was a really good article on the subject which I can't find now, written when Russia reformed the 1st Guards Tank Army in 2014. That reformation meant they assessed a serious risk of a peer conflict from their Western border, and needed a powerful combat formation optimized for such a fight. Russia has eaten 3 nation-shattering invasions along the Western axis of approach to Moscow (1812, 1915, 1941), where there are few natural geographic/terrain barriers. Do you see how sticking weapon systems in their near abroad that undermine their nuclear MAD deterrence, while expanding your military alliance ever-closer to their territory, might make them paranoid?