So, the Russians are going to arm one side in Syria, and we're going to arm the other side. For some reason, that sounds familiar . . . . Say, there was a Star Trek episode about that, where Capt. Kirk discovers that the Klingons have been arming one tribe on a semi-primitive planet, thereby gaining an upper hand on another tribe (which Kirk had surveyed years ago). Kirk evens things up by arming his side with exactly the same level of firepower, no more, no less.
"Jim, that means you're condemning this whole planet to a war that may never end! It could go on for year after year! Massacre after massacre!"
- - McCoy, shocked at Kirk's plan to arm the Hill People
"A balance of power. The trickiest, most difficult, dirtiest game of them all, but the only one that preserves both sides."
- - Kirk, justifying his plan to McCoy
"Well, war isn't a good life, but it's life."
- - Kirk, telling McCoy the bitter realities of war
(quotes taken from the Memory Alpha wiki)
I'm no expert on Syria, but I'm pretty sure there are no mugatus there: