[xiaoma]

The UN is useless anytime the interests of the US, China, Russia or other veto wielding countries are involved.

[abpavel]

Or friends of any of those. Which in essence renders the whole UN useless.

[bhouston]

The UN isn't useless when dealing with countries that do not have many friends, like Iran or Somalia, etc. But yeah, the UN is useless when it comes to major powers and those protected by the major powers.

[humanrebar]

The UN is not stopping nuclear proliferation in friendless countries, which really undermines the entire purpose of the UN.