If the UN imposes something on one of those member states that they disagree with while refusing to impose something on a US ally that everyone else agrees with. You know, like how the UN has voted to denounce Russian aggression in Ukraine and penalized them for it, but is unable to do the same for Israel's aggression in Palestine (and Lebanon and Iran etc). Consequences for thee, not for me!

So if the African countries rebelling against ECOWAS and the countries involved in China's belt-and-road and the countries in Russia's envelope and all the so-called "pariah states" like Venezuela and Cuba decide they will not respect UN resolutions anymore...