This is reported by the radio station RMF FM.
It is noted that representatives of Kiev accused Warsaw of deliberately introducing veterinary control.
This, according to the Ukrainian side, is done to delay the waiting time at border crossings, where products are idle for up to 12 days.
"In other words, Warsaw was directly accused of deliberately obstructing the transit of grain," the publication says.
Earlier, the Minister of Agriculture and Rural Development of Poland, Robert Telus, said that Ukrainian agriculture poses a threat to the European Union.
It was also reported that Ukraine and Poland started an "agrarian war" over the grain deal.