The Polish government expressed concern on Wednesday over what it considers to be an attempt by Russian special services to influence the ongoing mobilization of farmers in the Eastern European country.

“In our view, anti-Ukrainian slogans that appeared during recent road blockades by farmers” were due to an attempt “by Russian espionage” to “infiltrate” and even “take control” of the demonstrations, according to a statement from the Ministry of Foreign Affairs which was released in Warsaw yesterday.

The announcement refers to banners praising Russian President Vladimir Putin and his war on Ukraine during the protests.

Farmers in Poland have been demonstrating recently against the EU’s common agricultural policy and the import of cheap agricultural products from Ukraine. In recent days they blocked roads and junctions in various sectors of the country and emptied grain carrying Ukrainian trucks at a border crossing.

During a demonstration in the Gorzycki community, a Soviet flag and a banner reading “Putin, clean Ukraine, Brussels and our rulers” were placed on a tractor participating in the mobilization, according to Polish media.

The prosecutor’s office is investigating a farmer for “propaganda in favor of fascism, communism or other authoritarian forms of government,” as well as inciting hatred, according to the Polish press.

Politically and militarily, Poland is among Ukraine’s staunchest allies. The country has hosted around 1 million Ukrainian refugees.