Norway, which received its first F-35s in 2017, has played an important role in the development and production of the jet.
The Russian planes were "not adhering to international norms" when Italian and Norwegian NATO jets were mobilized.
The Royal Navy also shadowed Russian military vessels passing through the English Channel this week, officials said.
Italian and Norwegian jets responded under NATO authority on Tuesday to multiple Russian aircraft “not adhering to ...
Italy's air force intercepted a Russian Coot-A plane flying over the Baltic Sea, while the Norwegian F-35s identified multiple Russian aircraft off the coast of Norway, NATO Air Command said.
Italy's air force intercepted a Russian Coot-A plane flying over the Baltic Sea, while the Norwegian F-35s identified multiple Russian aircraft off the coast of Norway, NATO Air Command said.