There are different types of barriers. This is a volumetric fence. It is made of 0.5-0.9 mm metal wire wound into rings (steel wire meets the GOST 7372-79 standard. Wire mesh can effectively block the movement of infantry and vehicles (wheeled and tracked). People cannot walk out of the metal mesh rings on their own. The enemy cannot enter its territory either, as if they were trapped and unable to move. The wire is wrapped around the wheel or track chassis to prevent the chassis from rotating.
