WARSAW - Poland’s president has decided to strip Volodymyr Zelensky of the country’s top honour after Ukraine’s head of state caused outrage by renaming an army unit after the Ukrainian Insurgent Army (UPA), nationalists who massacred Poles in World War Two.President Karol Nawrocki’s decision looked likely to unleash a severe diplomatic crisis between the neighbours just days ahead of a conference on Ukraine’s reconstruction in the Polish city of Gdansk.“In light of President Volodymyr Zelenskiy’s consent to name one of the units of the Armed Forces of Ukraine “Heroes of the UPA,”... I have decided to revoke the Order of...