According to TheNews.pl. Sergei Dankvert, head of Rosselkhoznador, said action is being taken after Spanish pork marrow was found concealed in a consignment from Poland at the Belarusian border.

The marrow, which was discovered behind rows of meat labelled Polish, came from factories without permits to export to countries in Russia's customs union, which includes Belarus and Kazakhstan.

"From now on, all consignments of Polish pork – chilled or frozen – will be subject to strict inspections," Mr Dankvert told Russian newspaper Moskovskij Komsomolets.

The newspaper claimed that the move is the beginning of a "trade war" with Poland, stressing the discovery of E. coli bacteria in frozen beef and pork products from two Polish companies on 11 August.

The E. coli incident prompted Rosselkhoznador to state that "Poland's veterinary service had been warned about the inadmissibility of such violations."