The best way to fix this on a global scale is to finally reclassify China as a developed nation - they get subsidised postage worldwide as they’re considered a ‘developing nation’ - China are not a developing nation by any stretch of the imagination, but are given subsidised as if they are.
How the US went about it is the wrong way too, leaving the postage union isn’t how to do it - the subsidies are fine, they help actual developing nations have a fair go.
Additionally, even if it didn’t look weak, setting an established red line means Russia can snuggle right up to the line.