PARIS (Reuters) -France and Britain engaged in a diplomatic spat on Sunday over the treatment of Ukrainian refugees stuck in the French port of Calais, with UK Interior Minister Priti Patel defending Britain’s actions after earlier criticism from France. The spat marked the latest diplomatic row between the two countries following Britain’s departure from the European Union, which has resulted in arguments over how to tackle migrants crossing the English Channel, as well as fishing rights. The French Interior Minister Gerald Darmanin had urged Britain on Sunday to do more to help those Ukraini…