"Change always comes too late" (Star Trek - Picard iirc)
You need to account for digestion. Put your best efforts in, and provide the right situation for growth. Wait the appropriate amount of time, and then some.
Think, grandparents say profound shit that doesn't germinate with every grandchild until they're long gone and then some. Not everyone is a timely learner.
Has anyone considered Putin might simply be a compulsive liar, but for some strange reason it's not recognised in Russia?