The four Nordic countries agreed to operate their roughly 250 fighter jets in one fleet.
Sweden, Norway, Finland and Denmark, have modern air forces that include F-35s.
The air forces of four Nordic countries agreed to operate their fleets of around 250 fighter jets as a combined force, hoping to deter Russia by working together.
The invasion also prompted Sweden and Finland to seek entry into NATO, an alliance which already includes Denmark and Norway.
The joint force will be a worry for Russia, boasting a significant number of top-tier fighter jets.
Norway, Denmark, and Finland have all committed to the F-35 jets which are the most advanced Western fighter planes.
However, Russia's war in Ukraine led to further expansion of the alliance, and increased co-operation and defense spending by its members. »