Исаков, находясь на рынке, предложил Кряжину

Isakov, being on the market, suggested Kryazhin buy him an envelope with a total weight of 20 g with the inscription "heroin". When transferring the “goods”, Isakov and Kryazhin were detained. The audit established that the substance seized from Isakov was actually sleeping pills.
Give a legal assessment of the behavior of Isakov and Kryazhin.

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