The bad news as we all know by now is that the People's Liberation Army (PLA) claims it is developing a maneuverable antiship ballistic-missile (ASBM) warhead that can effectively target moving ships, particularly aircraft carriers, operating far off the littoral.
The good news is that near-off-the-shelf solutions can defeat such a weapon. These are capabilities that the United States already tested or even formerly possessed that could be modified for use by the current Fleet. While not necessarily inexpensive, they are capabilities whose research and development costs are already (and the only thing) sunk. In other words, they are already paid for and could provide considerable leverage in fashioning modern variants.