No. 13,909 in Russian
обороной
"Обороной" means "defense" (instrumental case of "оборона").
In a sentence
Город удерживался мощной обороной.
The city was defended with a strong defense.
The word 'обороной' is used as an instrumental case of the noun 'оборона', signifying the means by which the city was defended.
На встрече обсуждали вопросы, связанные с государственнои́ обороной.
The meeting discussed issues related to the state's defense.
Here, 'обороной' functions as an instrumental case, emphasizing the association with the concept of 'national defense'.
Он гордился победой, достигнутой благодаря хорошо организованной обороной.
He was proud of the victory achieved thanks to the well-organized defense.
In this context, 'обороной' is used to describe the means or method through which a victory was achieved, employing the instrumental case of the noun.
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