Same way as my last answer you weak individual.Ok the UAVs launch from the back of a truck, ISO container, ship or Volvo V70... Though we will exclude shopping trolleys. They don't need a runway.
Let's say they loiter out of visual range or above cloud cover and listen out for the distinctive whine of a jet engine, then glide in on the 'worth their weight in gold' fighter..
How are you going to defend against them?