The renaming of the piazza - which is used as a car park - has angered Ukraine's ambassador in Rome, Yevhen Perelygin. In a letter to the region's prefect, he asks for the decision to be revoked, saying the events of May 2014 are still unclear. He also suggested in an interview that the decision was "manipulated by political forces who support the Russian initiative" in Ukraine, something the mayor refutes. Mr Cattaneo appears to be defiant, despite a request from the regional authority to undo the change, and says Italy shouldn't be allowing foreign interference in decision making. "Piazza for the Martyrs of Odessa is there and will remain," he tweeted. "In Ceriano there's a democratically elected local authority. It is not Ukraine."