"Why not push for a weapons embargo on the entire region?"

Good idea!

The U.S. is responsible for nearly 33% of worldwide exports -- by far the top arms exporter on the planet -- but which countries does the U.S. sell the most weapons to?

Experts believe the Middle East will remain a top destination for weapons for some time -- it currently accounts for about 40% of U.S. arms exports -- 

http://www.cnn.com/2016/05/24/politics/us-arms-sales-worldwide/