The UN mission in Florida feels a little inexplicable. You'd think a UN mission touching down on American soil would have a bigger implication than just being a mini-boss for an AWD campaign. They just disappear after you kill them, "oh well, we tried." Also, do Russia/EU/China/PDTO countries get any chances to assist them or something? I've only played America campaigns and a little bit of France.
UN Florida (as it is) should be removed, but a UN faction would be a good idea in some other execution. It currently just is jarring. If you want it to be an OIR against AWD, it should show up after you take over Florida and it should be a bigger threat.
As far as I know Germany and Russia don't get decisions to aid the UN. On a sidenote I wouldn't mind having multiple UN missions in America, like one in Florida, another in Staten Island, and another in Oakley/the general San Fransisco bay area. All three could have a shared military & economic tree but separate political trees for dealing with the respective factions in their area, all having a shared GUI to call on aid from pre-European War Europe or WEF-NWO EU or if they're really desperate the PDTO and support each other, i.e letting them be the only three nations that are ACW participants that can send volunteers to anyone.
If they want they can either ally with Biden and subsequently get annexed by him if he reunifies America, vie with the UoA for influence/give the UoA buffs in exchange for influence over them and if they have enough influence annex them so they can go on to reunify America, or outright betray him for full globalist control of America. Naturally they'll be hostile to everyone but Biden, and when they reunify their respective regions of America (Northwest & Great Lakes, Southern states up to the Potomac and Mississippi, the West Coast and Rockies) they get annexed by the player controlled tag and form the "United Nations Reconstruction Authority of the Former United States" or some other long beaurucratic name.
Naturally when dealing with separatist and extremist factions like the NSM and Cascadia, they'll be outright hostile, but they can choose to either ally with state authorities in exchange for more allies or alternatively go against them if they betrayed Biden for legitimacy and standard attack bonuses.
Each UN mission can be slightly politically different, the Florida mission can be the moderate one, allowing some dissent and slightly loosening rules of engagement to take on AWD remnants. The Northwest one can be the most liberal since they'll be in an already compliant region, having political freedoms on par with pre-war America but repressing right wing views. The West Coast one will be the most extreme, being an outright military junta with the most loose rules of engagement since they're dealing with Cascadia, the USAF in Area 51, the Folkish Movement in Nevada, the APLA and California State Militia, and particularly all the dozens of gangs from the Crips & Bloods to the Aryan Brotherhood.
oh and they should add a salafist breakaway in michigan that's dependent on some events happening in pre-war america, like the NSM attack some arabs and not intervening or some such. i'm still nostalgic about that american ISIS faction in Make America Again