Wagner will probably be nationalised, at least it would be the most rational thing to do. They are good soldiers who are properly trained, they would be wonderful assets, and it would give him more control over what's going on. But Russia will not kill them, that I can guarantee, otherwise they wouldn't have taken that decision, if they didn't kill them while they were heading to Moscow, it's because they wanted to avoid a bloodshed, and possibly more turmoil.