He doesn't.
The big problem, even if millions of civilians are suddenly ready to fight and pull out their handguns and rifles..... The military have tanks, and rockets, and drones that assassinate from thousands of feet up. There's no way people could fight that.
He is already packing upper leadership with people loyal to him. You can't take control of a gov by force without a military backing you.
He is a narcicist with launch codes.
I'm sure he would rather destroy the world than look bad and lose power.