On: Submarine cable map

[masklinn]

Most of their connections are probably overland.

You also seem to be way off on the number of connections, I count at least 4:

* RJCN and HSCS to Japan (one to the mainland across the sea of japan, the other between Sakhalin and Hokkaido)

* BCS North to Finland

* a Georgia-Russia link (lands south of South Ossetia, outside the occupied territories)

* Kerch to Ukraine, though that's in occupied Crimea so…

[walrus01 → masklinn]

Overland links to Europe are most of it. If you look at the number of major Russian ISPs that are members of the DE-CIX in Frankfurt, that's a good indicator of traffic flows.

edit: for example, here's the v4/v6 peering locations for a major russian telecom: https://www.peeringdb.com/net/1265