[wwwwewwww]

I can't tell the relationship in your example.

Do you mean relationship in terms of appearance or pronunciation?

Я maps to "ya" sound in Russian, И is "ee" and Н is "N" in Russian and "ee" in modern Greek but in ancient Greek it's something like "e" in "bed" in American English.

[efskap]

Appearance. I'm just talking about typefaces - absolutely nothing to do with pronunciation.

Some fonts do not have Cyrillic glyphs. If they could be generated by an adequately trained model based on the other glyphs, then that font's multilingual coverage could expand automatically.

[wwwwewwww]

I get it now. That's interesting - generating missing letterforms!

[necovek]

GP likely meant the relationship in appearance: the two examples have Cyrillic glyphs closely resemble mirrored outlines of the Latin glyphs.