Can those ballistic missiles actually hit anything? They're converted ICBMs, and require some kind of terminal guidance. Something traveling Mach 10+ can't use

Can those ballistic missiles actually hit anything? They're converted ICBMs, and require some kind of terminal guidance. Something traveling Mach 10+ can't use radar or infrared guidance. How does it hit a maneuvering ship? Current thinking is drones or some other local surveillance would be used, radio linked to the DF-21. I wonder how well that will work alongside US electronic warfare capabilities? Interesting stuff...