This is just HE.net's network (with an overlay of submarine cables globally), very few if any US or EU based network operators have network presences in Russia or China (perhaps with the exception of Moscow and St Petersburg).
If you look at the european POPs of major eastern european and Russian ISPs, everything in Russia that counts as a major carrier or ISP has established a presence at DE-CIX Frankfurt. The various buildings in Frankfurt that house DE-CIX switches are full of PNIs between big ISPs.
This is a topology diagram at layer 3 for their BGP / ipv4 and ipv6 network - nobody should confuse it with OSI layer 1 cable reality for where routes physically are, except at the most gross level of detail (POP in Paris is linked to POP in London, for example).
I've taken a look at this project in some detail, and it doesn't correspond with reality in many places. I have NDAed precision GIS datasets for things they're showing on their map, and they are nowhere near the actual location. In particular the submarine cable maps can be treated as logical diagrams and not physical reality.
The biggest carriers with fiber routes are NOT going to share the precision GIS datasets with a public site that will publish them for everyone to see. I have maps of hundreds of regen huts, vaults, aerial fiber splice cases and fiber routes for paths between seattle, salt lake city, denver, boise, sacramento and things throughout the western US, and they look nothing like Network Atlas' maps.
As a project it is an admirable goal, but I don't see the actual owners of the dark fiber choosing to make their data public any time soon.
