It is a bluff, why would Russia want to start a nuclear war with the NATO nuclear powers?
I keep asking you, what is going on that makes Russia want to commit suicide?
I dont think you understand what tactical nukes are.
Putin isn’t bluffing. This war will escalate if NATO arms Ukraine and if NATO decides to fight Russian troops in Ukraine then it will most likely go nuclear. Why would NATO want to commit suicide? Nobody does but it could end that way once things get set in motion.