OP probably meant hypersonics, of which USN / everyone else has no current defenses against. TLDR of a recent panel on state of anti-hypersonics is Pentagon hop

OP probably meant hypersonics, of which USN / everyone else has no current defenses against. TLDR of a recent panel on state of anti-hypersonics is Pentagon hopes to have a "workable" defense against hypersonics by mid-2020s.