The Volhynia massacres, in which Ukrainian nationalists killed around 100,000 Poles, have long caused tensions between Warsaw and Kyiv.

The Volhynia massacres, in which Ukrainian nationalists killed around 100,000 Poles, have long caused tensions between Warsaw and Kyiv.
The ruling coalition has criticised the decision and argued it emphasises the importance of electing a more government-friendly president.
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Military personnel from the US and Portugal are also taking part.
The suspects – who are Polish citizens, according to the Lithuanian authorities – are facing charges of acting on behalf of a foreign country’s security services.
Among the tasks reportedly assigned to him was gathering information on security at Rzeszów airport.
The pair claim to be victims of “political repression” by the government.
“He [Duda] is my friend, and we had four great years together and we may have to do it again,” said Trump.
But Warsaw will push for a “de-escalation” of the situation.
One post suggested a young opposition activist owed his position to providing sexual favours and another mocked the size of a journalist’s penis.
The EU has transferred almost almost 27 billion zloty (€6.3 billion) to Poland.
Two days earlier, parliament gave initial approval to legislation that would soften Poland’s strict abortion laws.
But he warns this could only happen by changing the constitution.
But the bills still face a number of major hurdles.
It is “unfair towards students attending religious classes”, says the Catholic church.