Thus he is drawing Syria (and its distinct conflicts with both Turkey and Israel) into the European War, which will get Iran involved. Given that the Syrians whom Russia is allied with in Syria (where Russia has a significant military presence) tend to be the most friendly towards Christians, it doesn’t seem to be a “look, we’ve recruited savages” thing. It may be part of a desire of Russia to represent itself as the champion of Eastern Christianity (heck, if they can say Ukraine is run by a Nazi, why not claim Putin is defending Christianity).
Russia has many IOU’s from Syria and probably wants non-Russians for canon fodder. How use soldiers with no experience in a European climate and geographic conditions would be is questionable. The real danger is that this will make it more likely for Turkey to decide its a wonderful time to invade Syria. While the Israelis aren’t involved, having a war in your neighborhood can be problematic.