Russia has too few submarines to use them routinely for conspicuous visits around the world. Surfacing reveals a submarine's location and makes its sound patterns easier to track. These disadvantages make a submarine a poor substitute for a surface ship's diplomatic presence. Such a visit remains possible when time is short and no surface ship can reach the destination.
Notable Point · 46:56-47:35
Why submarines are awkward diplomatic substitutes
A conspicuous submarine visit sacrifices concealment and uses a scarce asset, although it can still be an option when no surface ship can arrive in time.