The problem with type of action (historically speaking) it tends to grow. Akin to the "Camel nose under the tent" action. Taxes are another good example, one established, they don't go away, and almost always seem to grow. I dare day if the Fed govt. places a 5 cent(excise) tax on every pair of shoes sold in the US (to help fund sidewalks), it wouldn't be but a few years before it was $1.00 a pair, and growing. It would also lead to taxes on anything else that ever touched a sidewalk, or could touch a side walk. Maybe even the BATFEA could add another letter: "S", for sidewalks.
Govt's selling arms to one another, or the equipment to mfg arms, is best controlled by trade agreements etc. There are nations (most of them) voting at the UN on things that they don't seem to have any experience with, nor expertise in. We as a country do not seem to back up our bark with enough bites. Example: French made NV equipment to the Taliban, and Iraq insurgents, I don't recall an embargo of French good to the US. Much of the large equipment being used in Iran to mfg atomic weapons is being made in Germany-again no embargo, and as it goes. We don't need a bunch idiots in the UN to tell the US what to do, we need leaders willing to place the US first in their every decision. We can't go to war with everyone, but we can keep them from doing business in the US, that scares them far worse.