The areas of technology each country leads
USA : weapons, jet propulsion, microprocessor, software, AI, medical science and drugs, computer imaging(CGI).
Russia : rocket propulsion, space exploration, ICBM and SLBM.
Korea : 5G communication, chip fabrication, EV battery, commercial fission power plants, fusion reactors, fuel cell, display technology.
Japan : Stem cell, Robotics
China : Drones, the Internet and content control, Solar Power, bitcoin mining.
UK : UK is a not a technology leader anymore, more of a finance driven economy.
If you ask for the rank, I would say
USA > Russia > Korea > China > Japan > UK.
Another good source of measuring the Innovation is Bloomberg’s Innovation Index. These Are the World’s Most Innovative Economies