Not even the occupiers were allowed to enter the border zone
In August 1968, Dalibor Plšek was serving as an officer in a company of the border guard in Maxov. When Soviet troops started to arrived at the border between the village of Mlýneček and the village of Filipova hora, he stopped them and told the Soviet commander that they could not go any further. He explained that the sign read “Entering the border zone allowed only with a permit.” He asked if the Soviets had this permit, called a “bumážka.” After the Russian replied that they didn’t have a permit, Dalibor responded that the border guard was responsible for the border zone and that nothing requiring military action was happening there. He told the Russian occupiers to return to the interior, which they actually did.