Volodymyr Zelenskyy and Donald Tusk reach agreement on massacre of up to 100,000 Poles by Ukrainian nationalists

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Poland has hailed a breakthrough in a painful historical dispute with Ukraine, after it said its neighbour had agreed to allow exhumations of Polish citizens massacred by Ukrainian nationalists in the second world war.

Warsaw is one of Ukraine’s strongest supporters in the EU, offering military and diplomatic support, but for years ties have been strained over a historical atrocity – the massacre of as many as 100,000 Poles by Ukrainian nationalists between 1943 and 1945.