If Assad and Russia were really fighting ISIS, that would make sense.
This is what I think Trump discovered. Trump was under the impression during the campaign that he could form an alliance with Putin and possibly Assad to fight ISIS.
Once elected, Trump discovered what a lot of others have been saying, that Russia is there mainly to maintain their warm water port and keep a friendly regime in power. They are not fighting ISIS too much.
Is it our concern? Maybe not.
911 needs to be totally investigated still, I would not forget most of the hijackers were in Iran in the previous 18 months, Assad’s buddies. Iran convicted in a US court: http://www.iran911case.com/