Yeah, but Syria under Assad was also a big buyer of Russian arms, and could also be used as a bargaining chip (if we don't like something west does, we'll install missiles in Syria, destabilize the region, that sort of stuff).
I'm somewhat surprised they haven't helped Assad so far. It may be that indeed a port is more important to them than anything else and they think it would be much easier to deal with rebels (if the eventually win) if they are neutral during the conflict.
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