At the Geneva Superpower Summit in November 1985, American President Ronald Reagan met with the Soviet Union's General Secretary Mikhail Gorbachev. The two leaders discussed international diplomacy and the arms race. Gorbachev proposed to Reagan an idea for an international project to develop fusion energy for peaceful purposes. One year later, international leaders reached an agreement: the Soviet Union, Japan, the U.S., and the European Union would work together to design a large international fusion center. Later, other countries joined the agreement. Some 30 years after Gorbachev and Reagan's meeting, the project is continuing. The facility, named the International Thermonuclear Experimental Reactor, or ITER, is often called the most complicated scientific instrument in the world.