ΔE 7.7, close: similar, with a visible difference side by side. Russian AF Blue is more saturated than Intermediate Blue (US Navy).
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Russian AF Blue is more saturated than Intermediate Blue (US Navy).
The same difference applies the other way round: Intermediate Blue (US Navy) is more muted.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Intermediate Blue (US Navy) on the colour wheel See Russian AF Blue on the colour wheel
All matches: Intermediate Blue (US Navy) equivalents · Russian AF Blue equivalents