expression
in any case; no matter what; under any circumstances
A fixed expression meaning 'regardless of the situation' or 'whatever happens'. Often used in formal or emphatic contexts.
いかなる場合でも、規則は守らなければならない。
In any case, you must follow the rules.
いかなる場合でも、嘘をついてはいけない。
Under no circumstances should you tell a lie.
Compound of いかなる (formal/literary adnominal form of いか, 'how') + 場合 (situation) + でも (even if). The phrase is a fixed formal expression.