Polish farmers take part in a demonstration against cheap food imports they say are undercutting their products outside the presidential palace on February 6, 2019 in Warsaw. - Farmers also demand an effective support to farmers affected by the latest outbreak of African swine fever (ASF) in the country. (Photo by Janek SKARZYNSKI / AFP)

Polish farmers hold national flags during a demonstration against cheap food imports they say are undercutting their products outside the presidential palace on February 6, 2019 in Warsaw. - Farmers also demand an effective support to farmers affected by the latest outbreak of African swine fever (ASF) in the country. (Photo by Janek SKARZYNSKI / AFP)

A Polish farmer holds a national flag during a demonstration against cheap food imports they say are undercutting their products outside the presidential palace on February 6, 2019 in Warsaw. - Farmers also demand an effective support to farmers affected by the latest outbreak of African swine fever (ASF) in the country. (Photo by Janek SKARZYNSKI / AFP)

Polish farmers hold a banner reading "funeral of Polish agriculture" during a demonstration against cheap food imports they say are undercutting their products outside the presidential palace on February 6, 2019 in Warsaw. - Farmers also demand an effective support to farmers affected by the latest outbreak of African swine fever (ASF) in the country. (Photo by Janek SKARZYNSKI / AFP)

Polish farmers hold national flags during a demonstration against cheap food imports they say are undercutting their products outside the presidential palace on February 6, 2019 in Warsaw. - Farmers also demand an effective support to farmers affected by the latest outbreak of African swine fever (ASF) in the country. (Photo by Janek SKARZYNSKI / AFP)