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CaseSingularPlural
Nominativeименительный · кто? что?враг враги the subject: who or what acts
Accusativeвинительный · кого? что?врага врагов the direct object of the verb
Genitiveродительный · кого? чего?врага врагов possession, absence, "of"-phrases
Dativeдательный · кому? чему?врагу врагам the receiver: to or for someone
Instrumentalтворительный · кем? чем?врагом врагами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?враге врагах location and topics: in, at, about

Враг is animate, so its accusative copies the genitive: the form after "I see..." matches the form after "of".

Look up any other word in the Russian declension tool, see where враг ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

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Slova drills враг and every word like it with typed case endings, checked letter by letter.

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