Extortion is the right word here.
The problem is that virtually the entire new world and much of the old world was acquired by force and threats of force that has been legitimized over time. So yes, I think this is clearly extortion and any sale that takes would be coerced.
But ever was it thus.
For sure in the future I'm sure the US will teach that it was a fair deal and nato was corrupt anyway but I hate to see the whitewashing of it going on already like it's a casual land purchase offer