Conventional Technical resources / helicopter
It is important not to neglect the use of conventional technical means. Especially when preventing unauthorized border crossings, the old methods are supposedly the most effective. Blocking measures at the border such as fences, ditches, bollards, barriers, etc., in interaction with cameras, radars, speakers and microphones, for example.
But the "normal" patrol, supported by reconnaissance from the air, on land and water is a guarantee for a good border protection.