re: Withdrawing doesn't mean isolationism
It's a global world with a global economy and a global environment; the US badly needs China. What goes on in the Middle-East can be a matter of tactics and pressure on this or that side.
There are EU countries with very different issues.
But these things seem obvious (and I'm sure that's why the EU doesn't want to interfere): countries are sovereign AND if any of them has something we need, we'll buy from them, no matter what the regime is, because that is an internal matter of that country.
That country, no matter its regime , will only be too glad to have customers.