Is it really on Kirov's empty boat?

Kirov's empty boat doesn't exist. Airships were used for military purposes in the First World War. Later, the airship was converted to civilian use, mainly for sightseeing and performances.

I don't know if you have noticed that Kirov's empty ship voice in RA2 is "Helium mixed", which shows that people have realized that it is extremely dangerous to use hydrogen as a buoyancy source and switched to stable helium.

Theoretically, fighters are more advanced than airships, but according to the story of RA2, after the victory of RA 1 Allied Forces, the Soviet Union was forbidden to use MIG fighters, so the Soviet Union developed Kirov.