The Russia also has a surplus of old, free-fall bombs in 250, 500 and 1000 kg variety; so, shall we in that case operate the NATO way and bomb the offenders back into the stone-age like NATO did with Serbia?
Do you really, REALLY think that USA needs to go head-to-head with Russia again?
because you know, there's always an enemy of an enemy, and if you ship some arms to the enemy of state A, that A state may seem fit to ship some other arms (i.e. surplus SAM missiles or surplus RPG launchers or whatever else) to the state B, which is (or could be) enemy of YOUR state.