Sea drones have proved very effective for Ukraine against Russia's navy — and now the Houthis are threatening US warships in the Red Sea.
  • Houthi rebels are threatening US warships and shipping using naval drones, a new report said.
  • The commander of a US Navy carrier strike group says these weapons are among the more frightening.
  • The use of cheap sea drones has been pioneered, to considerable success, by Ukraine.