It was the Chi Coms. A Russian boomer could not sneak through our defenses as we track them by their radiation trails. They leak like sieves.
If this was in fact a missile literally dozens if not hundreds of military personnel throughout the country would know it. Somehow I think one of them would call/leak it to the NY Slimes or Washington Post about the surprise missile launch off L.A. Even rumours of it would have spread everywhere. NORAD, Vandenberg, countless other bases, the Pacific fleet...we are talking a massive coverup that would surpass the coverup that we actually landed on the moon.../sarc.