What is the difference between Big City and Moscow City?

Moscow-City and Big City are interconnected but different concepts. Moscow-City (MIBC "Moscow-City") is a specific international business center with an area of ~60 hectares with a group of already built skyscrapers on Presnenskaya Embankment. Moscow-City is understood as a "core" of 20+ towers, including "Federation", "Mercury", "OKO" and others, with infrastructure (Afimall shopping center, Bagration bridge, etc.). In turn, "Big City" is the territory adjacent to this core with an area of about 800-1000 hectares, the development of which has been launched by the city. Big City includes new projects outside the boundaries of the main site - residential complexes (for example, City Park, "Beregovoy"), business centers (iCITY, "Oktyabrskoye Pole Technopark", "STONE" complexes on Khodynka), social facilities and roads. Thus, the difference is that Moscow-City is an already formed business district of skyscrapers, while Big City is a wider area around it, where new high-rise clusters will appear by 2030–2040, connected by transport and infrastructure to the core.