The UN doesn’t HAVE a navy. It’s an organizing body, a treaty organization –

They didn’t need a navy but organization at getting things done. Go read how they wasted time looking for appropriate accommodation before they set foot in the country, and their reaction to the US’ “unilateral” action in sending in the military to help.
Go read about Malloch Brown and his machinations in the UN, along with his pal George Soros in their corrupt effort for global governance.