The Eurasian Bloc is an astropolitical and economic entity which formed out many European Union countries along with Japan, South Korea, Vietnam, and Singapore in the aftermath of the political upheaval following the Khan Solar Storm of 187 BFC. It was never strictly Eurasian as it included French, Dutch, Portuguese, and Spanish overseas territories in South America and the Caribbean, North-West Africa, and Oceania. Over time it has grown, to encompass the newly created Aruba y Paraguaná during the Reset of Nations, Japan's seizure of Enkaishū (Russia's Primorsky Krai) once the Eurasian SDI was operational, and also to include later French protectorates in North-West Africa. Many non-bloc countries have customs unions with the Bloc, including the United Kingdom, Norway, Switzerland, Bharat, Australia, and New Zealand. The Bloc's treaties of governance primarily concern trade, colony administration, and defence, leaving its constituent members with legislative autonomy in other areas. It is governed by a supranational bureaucracy supplemented with meritocratic sortition, whereby a random selection of experts is drawn from the general populace for the purposes of drafting legislation.

The proposal for a new set of international treaties to replace the role the U.S. and NATO had played prior to Khan was first made by Japanese Defense Minister Matsumoto Koji at the Lausanne Convention in 185 BFC. Due to the 2nd Japanese Economic Miracle and integration into the economies of Bloc countries via its supply of AMSSTs Japan was able to play a major role in the construction of the Bloc's political organisations, despite having only a small percentage of the total population of the Bloc countries. Over time the French have taken a larger role in leadership as their economy recovered and (including their colonies and integrated protectorates), and the combined French and East Asian leadership cultures has created inflexible bureaucratic institutions that are strongly engineering and environmentally focused. The Eurasian Bloc countries are the third largest contributor to the Peacekeepers (after the United States and Bharat) and often align with the US against the non-Peacekeeper space power blocs of Greater Zhōngguó, Dominio, Türkiye, and the Fatimid Trade Caliphate.