Well I guess I should make the case for Blackmail. Yep that's what ol'Trumpybear did. He tried to Blackmail that president into publicly announcing that the Ukraine was opening an investingation into the Bidens corruption.
Blackmail I tells ya.
Doesn't matter what you call it. The turd still stinks.
Considering that the withholding of the Javelins would predictably result in (additional) Ukrainian wounded and dead, you might even call it "exaction".
There is another aspect that I find is widely overlooked. Nothing yells "anti-corruption crusade" like removing a widely admired anti-corruption crusader from her office. Oh, wait, there is one better than that:
Nothing yells "anti-corruption crusade" as loudly as urging your counterpart to bring the power of the state to bear on a political opponent in an obviously politically motivated "investigation". That's going to teach them Ukrainians a lesson, doesn't it?
That's the U.S. of A. under Trump in a nutshell, teaching the world a lesson in corruption. Devastating though this is, the number of folks who would go along with all that is worse, still.