Theoretically, during the period when there was no agreement with Koschei, it was possible to break through on some trucks past less controlled sections of the border and capture slaves. But firstly, most of the Steelmen wouldn't return from such raids. Secondly, the opposite situation was also very likely. It's unlikely that the Mushroom People would raid for slaves (just for slaves), but to "simply rob," given the nation's psychology and the presence of pirates in the northern seas, it's quite possible. In principle, we can postulate that yours are raiding ours, and ours are raiding yours, and that's how we live (or lived in the not-so-distant past). But this, in any case, already affects your statement.
Theoretically, during the period when there was no agreement with Koschei, it was possible to break through on some trucks past less controlled sections of the border and capture slaves. But firstly, most of the Steelmen wouldn't return from such raids. Secondly, the opposite situation was also very likely. It's unlikely that the Mushroom People would raid for slaves (just for slaves), but to "simply rob," given the nation's psychology and the presence of pirates in the northern seas, it's quite possible. In principle, we can postulate that yours are raiding ours, and ours are raiding yours, and that's how we live (or lived in the not-so-distant past). But this, in any case, already affects your statement.