The prime ministers of Ukraine and Poland said they made progress on Thursday toward meeting demands of Polish and western European farmers who want restrictions on cheap Ukrainian food imports that they say undermine their livelihoods, but they announced no breakthrough. Ukraine’s Prime Minister Denys Shmyhal was in Poland for talks with his counterpart, Donald Tusk, to find ways of addressing the farmers’ discontent that has led to violent protests and blockades of Poland’s border crossings with Ukraine. The leaders said some proposals were made during the talks but that more work was needed…