This is the 17997th most frequent Russian word.
фиктивную
"Fictitious" or "false."
In this sentence, 'фиктивную' (fictitious) refers to something fake or fabricated, specifically used for deals or agreements to manipulate a situation.
Они заключили фиктивную сделку, чтобы избежать уплаты налогов.
They made a fictitious deal to evade taxes.
Here, 'фиктивную' modifies 'документацию' (documentation), indicating that the paperwork was falsified or forged.
Эта организация использовала фиктивную документацию для получения разрешений.
This organization used fictitious documentation to obtain permits.
In this example, 'фиктивную' is describing a 'историю' (story), implying that the narrative is invented or untrue.