From Euractiv.com:
Slovakia’s decision to reintroduce wolf hunting has outraged Czechia, who fear it could endanger the wolf population of the Beskid Mountains, which stretches from Czechia to Slovakia, as well as violate EU rules.
Wolves are still protected in Czechia and are also covered by the EU’s Habitats Directive. Czechia included them on its national list of protected species under the directive, which is not the case in Slovakia, meaning any wolves straying across the border are at risk of being killed.