A unified authority composed of the governments of North America, South America, Europe, North Africa, Australia, most of Asia and Russia.
Technically the UEG cannot overrule the leadership of any country, but so far no nation that's part of the alliance has made any major moves of dissent.
Major countries not participating in the UEG are India(Cultist control), Pakistan(Cultist control), Mexico(Cultist control) and Canada(distrust of the Mi-Go/Human alliance).
The UEG's major supplier of equipment(military or otherwise) is the multinational Starlight Enterprises, and it occasionally subcontracts security operations to either the Vatican or PMC's.
The UEG has withdrawn all scientific operations from Antarctica and all travel to the continent is banned.