I asked this question in the Unix & Linux community, where I think it is on-topic but nobody who knows noticed (and answered) it, so I am repeating it here, although I fear it may be off-topic, but at least someone who knows will probably notice!
I use KDE and have enabled the Russian keyboard layout. This works fine except that I see no opportunity to add accents to vowels. Is this in fact possible? I wish to use them in applications such as Kate (which uses Unicode/UTF-8 for my document), to mark accented syllables to aid my pronunciation. The help for System Settings - Keyboard talks about levels of keys, but does not say what that means.
I would have expected there to be a dead key for the accent, but cannot find one. If necessary I would be prepared to edit configuration files, but it seems to me unlikely that that would be necessary.
I have my keyboard model set to generic 101-key PC,and my keyboard is a Dell model SK-8115, attached via USB to an Acer laptop. My Linux is Open Suse Leap 15.0 with the latest updates.
That said, I see that the question: “Does anyone know of a simpler way to add accents to Cyrillic vowels than what is typically found online?” is regarded as on-topic and is very close to what I ask, except that is is for MS Windows rather than Linux. I shall post this now, and then see if I can solve my problem with an approach similar to that in the answers to that question.