Ukrainian arms flood into Poland. Just last year tens of thousands of weapons were smuggled into Poland.It seems that the purpose is to build an underground Ukrainian army.
In 2014 Polish authorities confiscated 14 weapons on the Ukraine-Poland border, 26 items in 2015 and 30 in 2016. In 2017 Polish authorities confiscated 49 smuggled weapons. On its website Poland’s Border Service provides information on all arms confiscated on its borders. https://www.strazgraniczna.pl/pl/granica/statystyki-sg/2206,Statystyki-SG.html. No evidence suggesting that an underground army is being created.
Further debunking: https://www.stopfake.org/en/fake-ukrainian-arms-flood-into-poland/