
France has been awarded a project to build a 10bn-euro ($12bn) nuclear fusion reactor, in the face of strong competition from Japan.
The International Thermonuclear Experimental Reactor (Iter) will be the most expensive joint scientific project after the International Space Station.
The Iter project was held up for over 18 months as parties tried to broker a deal between the two rivals.
Nuclear fusion taps energy from reactions like those that heat the Sun.
Nuclear fusion is seen as a cleaner approach to energy production than nuclear fission and fossil fuels.
Officials from a six-party consortium signed the deal in Moscow on Tuesday.