Italy's prime minister and France's president put on a show of unity on Sunday, dismissing suggestions of tensions between their countries over handling the waves of migrants landing on southern Europe's shores. Ministers in Paris and Rome have exchanged barbs after France began turning back migrants at the French-Italian border earlier this month, invoking EU rules requiring refuge seekers to do so in the first European country where they set foot. Italy has long argued that it and Greece cannot cope alone with the influx just because they are the closest landing points for refugees and economic migrants from Africa and the Middle East streaming toward the European Union in rickety boats.