Poland’s prime minister told Ukrainian President Volodymyr Zelenskiy on Friday not to “insult” Poles, maintaining harsh rhetoric towards Kyiv after the Polish president had sought to defuse a simmering row over grain imports. Poland decided last week to extend a ban on Ukrainian grain imports, shaking Kyiv’s relationship with a neighbour that has been seen as one of its staunchest allies since Russia invaded Ukraine in February last year. Zelenskiy angered his neighbours when he told the United Nations General Assembly in New York that Kyiv was working to preserve land routes for grain exports, but that the “political theatre” around grain imports was only helping Moscow. “I… want to tell President Zelenskiy never to insult Poles again, as he did recently during his speech at the U.N.,” Prime Minister Mateusz Morawiecki told an election rally. Poland holds a parliamentary election on Oct 15, and Morawiecki’s ruling nationalist Law and Justice (PiS) party has come in for criticism from the far right for what it says is the government’s subservient attitude to Ukraine. Analysts say this has forced PiS, which looks set to remain the biggest party but may not secure a majority, to adopt a more confrontational approach to Kyiv in the closely fought campaign. Earlier on Friday, President Andrzej Duda, a PiS ally, had said the dispute between Poland and Ukraine over grain imports would not significantly affect good bilateral relations, in an apparent move to ease tensions. “I have no doubt that the dispute over the supply of grain from Ukraine to the Polish market is an absolute fragment of the entire Polish-Ukrainian relations,” Duda told a business conference. “I don’t believe that it can have a significant impact on them, so we need to solve this matter between us.” Meanwhile, in an article for Politico, Polish Foreign Minister Zbigniew Rau said Poland wanted to see “a strong Ukrainian state emerge from this war with a vibrant economy” and that Warsaw “will continue to back Ukraine’s efforts to join NATO and the EU”. “There’s absolutely no contradiction here.” Rau wrote. “Supporting Ukraine against Russia’s invasion and protecting our citizens and safeguarding them against unfair economic competition – both serve Poland’s interest simultaneously.” However, speaking to reporters in New York, Rau said that while Poland had not changed its policy towards Ukraine, there had been a “radical change in Polish public opinion’s perception” of the countries’ relations. Asked by state-run news agency PAP what it would take to improve this perception, Rau said repairing the atmosphere would require a “titanic” diplomatic effort.