Rather than let them rot in the desert or be torn appart for scrap, why not put them to good use? Some can be used as boosters to launch satellites, but the smaller ones can hardly leave the atmosphere.

Instead of a nuclear warhead, you could fill the rocket with a couple tons of gunpowder, various minerals to make colors, stars, and other effects. They could be exploded above uninhabited areas or water within sight of major cities on holidays such as Independence Day and New Year's.

Imagine a silo in the American west somewhere launches one of these things going east. It explodes over New York Harbor on July 4th in a spectacular red, white, and blue star. The Russians are puzzled by the satellite pictures but eventually satisfied that the treaty has been met.

Other uses include scaring the bejeezus out of anyone the USA happens to be at war with.