This is one of many stories on the topic. Russia absolutely announced it was recruiting Syrians and others in the Middle East to fight in Ukraine.
From what I can tell the effort had limited success.
Learn something.
https://stj-sy.org/en/new-testimonies-russia-continues-to-deploy-syrian-mercenaries-to-ukraine/
I don’t need to learn something from you.
I think it’s common knowledge both sides have used mercenaries to fight on their behalf.
The terrorists are captured. They’re already speaking out.