It's been a while since Oxygen Fonts 0.4 release and still cyrillic charaters are missing. I am using russian locale and sometimes the picture
Steps to Reproduce:
1. Switch KDE to locale which uses cyrillic symbols (e.g. ukrainian, bulgarian, russian, ...)
Cyrillic glyphs are drawn with other font (configured as fallback).
Cyrillic glyphs should be present in Oxygen fonts.
Created attachment 91513 [details]
How fonts look now: mixed Oxygen and DejaVu Sans
Yes, they're looks really bad.
The same report on launchpad: https://bugs.launchpad.net/ubuntu/+source/oxygen-fonts/+bug/1454672
Also, in git branch 'vernon-adams' there are already some draft versions. So why not at least merge the into master?
Created attachment 92582 [details]
Patch for merging latinic fonts from Plasma 5.2 to 'vernon-adams' branch
On my system I dowloaded code from git://anongit.kde.org/oxygen-fonts, switched to 'vernon-adams' branch and applied the attached patch (i.e. merged latinic glyphs from master).
Comme is the new name for the Oxygen Font family https://github.com/vernnobile/commeFont
*** This bug has been confirmed by popular vote. ***
Thanks for your bug report.
Unfortunately we do not have the resources to maintain this font anymore and moved upstream to using the Noto font  which also provides much better glyph coverage. We advise you do the same. Sorry.