The UEFA European Championship is the primary association football competition contested year between World Cup tournaments, it was originally called the UEFA European Nations' Cup, changing to the current name in Starting List of UEFA European · European Nations' Cup · UEFA European. The format for the inaugural European Nations ' Cup was designed to follow the setup UEFA had instituted for the continent's top club competition, with. What is the background to the UEFA Nations League? . In every even year there are World Cup or UEFA EURO winners; now in every odd.