In the history of the world, trade ultimatums have never worked. For example, the US has issued such ultimatums to pre-ww2 Japan, Cuba, Iran, and North Korea. Needless to say, in none of those cases did the embargoed country alter their behavior in the desired way.
And it is trivial to understand why such ultimatums don't work: they are political suicide to anyone that capitulates. Imagine if China gave such an ultimatum to the US. How popular do you think that would make China with US voters? A candidate campaigning on the platform of "we better just do what China tells us to," would be dead in the water.