There are no regimes for controlling exports of munitions, much less the sale of advanced conventional weaponry, such as cluster bombs, precision-guided munitions and cruise missiles.
Despite agreements (notably the Missile Technology Control Regime) against the transfer of high technology to irresponsible countries, during the Reagan and Bush administrations countries such as Iraq, Iran and Syria were the forbidden recipients of US-made weapons. The USA administration circumvented the law with covert transfers, usually via friendly countries such as Saudi Arabia.