obronnymi
Obronnymi is the instrumental plural form of the Polish adjective obronny, meaning defensive or protective. It is used to describe nouns in the instrumental case plural, indicating that the described nouns are used as means or in the context of defense. In practice, obronnymi appears in phrases such as środkami obronnymi (defensive means), działaniami obronnymi (defensive actions), and systemami obronnymi (defensive systems).
The adjective obronny is derived from the noun obrona (defense) and is related to concepts of protection,
Polish adjectives agree with their nouns in gender, number, and case, so obronnym appears in the instrumental