Directive on the Conservation of Natural Habitats and of Wild Fauna and Flora (EC Habitats Directive), Article 22 & Directive on the Conservation of Wild Birds (EC Birds Directive) Article 11
These Directives require member states to ensure that deliberate introduction of non-native species into the wild is regulated (and if necessary prohibited) so as not to prejudice natural habitats or wild native flora and fauna.
Wildlife Trade Regulations
As well as implementing the Convention on International Trade in Endangered Species (CITIES) within the EU, these Regulations also contain provisions (Article 4(6)(d)) to regulate the import and sale of species that present an ecological threat to native species.
This states that under Article 8(h), each Contracting Party shall "prevent the introduction of, control or eradicate those alien species which threaten ecosystems, habitats or species".
The Bern Convention
The Convention on the Conservation of European Wildlife and Natural Habitats Article 11(2)(b) states that each Contracting Party shall undertake to "strictly control the introduction of non-native species".