Pre-covid, this was a thriving and mostly legal industry. There are quotas on how much may be imported for personal consumption.

Meanwhile, the Swedes go to Denmark for cheap alcohol, the Danes go to Germany, the Germans to Poland and the Poles to Ukraine. Thus Ukraine is the fixed point of the alcohol-flow function. This theorem was proven when I was a PhD student in a research group which contained a Norwegian, a Swede, a German, a Pole and a Ukrainian - we extrapolated the Danish connection point.