What Putin actually considers casus belli isn't important for the moment - it could be anything, reasoned or not. Can we, here, present arguments that the desire of Russia to be able to attack neighbor countries should be honored? Do we extend MAD doctrine to non-nuclear matters - that is, everybody should refrain from defense, as defense reduces their neighbors' abilities to fight back in case those neighbors are attacked? Is it reasonable - for the moment - to think that countries, improving their defenses, actually offend neighbors?