Which countries and regions collaborated on the ITER fusion project?

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3D illustration of the interior reaction chamber of a tokamak fusion reactor, showing a large, cylindrical, metallic structure with curved walls and bright light panels. — fusion reactor A tokamak is a device used in nuclear-fusion research for magnetic confinement of plasma.

The International Thermonuclear Experimental Reactor (ITER) project is a major international collaboration aimed at demonstrating the feasibility of nuclear fusion as a large-scale energy source. The project involves a partnership between the following countries and regions:

European Union
United States
China
India
Japan
Russia
South Korea

These partners are working together to construct a prototype fusion reactor in southern France, which will feature the world’s largest tokamak.1