On Tuesday, a Polish MP presented the Ukrainian embassy with a ‘bill’ for $23 billion, recommending that Kiev reimburse the aid it got after suing Warsaw for imposing a restriction on grain imports from the country.According to the Kiel Institute for the World Economy, the ‘bill’ contained various types of support offered directly to Kiev by the Polish government, social benefits awarded to Ukrainian refugees, and private donations made by Polish nationals. The entire amount is most likely “significantly underestimated and incomplete,” according to Bosak.Ukraine has sued Poland before the World Trade Organization (WTO) and threatened to introduce trade restrictions...