Note that @Darker45 and @pooya87 are correct imo: Self-custody isn't technically banned in that Russian regulation.
It is not prohibited, provided that these crypto assets are held on licensed platforms (there are currently 13 such licensed platforms). However, crypto assets can't be withdrawn to one’s own non-custodial wallet, which, in effect, makes self-custody impossible. It amounts to a sort of veiled prohibition.
In short, this bill turns the entire concept of cryptocurrencies upside down.
But afaik interpreting the articles correctly it would only be possible to obtain self-custodied BTC through mining / cloud mining or buying before mid-2027.
Only if the recipient’s address (wallet) is managed by an organization that is authorized to manage wallets (belonging to others).
I wonder if Russia has an exception for "private non commercial trades", a lot of countries do have that and you can barter or trade most goods (excluding stuff like weapons or illegal drugs) without the State's intervention. If that exists, it would open a "hole" for cash-to-BTC trades between friends or neighbors.
Legally, barter is permitted in Russia under what is known as an "exchange agreement", which is used for "goods-for-goods" swaps.Cryptocurrencies are classified as "property" (this also applies to "digital currency", which can't be used as a means of payment - isn't that absurd?

), rather than as commodities. It is highly unlikely that this loophole could be exploited. It’s an interesting situation, really: market participants wait for official regulation, only to then start hunting for (advantageous) loopholes in the law. Doesn't it strike you that this type of regulation might be improper improper regulationor at least not what was expected?

They could also try perhaps to buy non-custodial BTC when abroad.
And stay right there.

By the way, if personal possession of crypto (in their own wallets) is prohibited in this country, it will "kill" the market for hardware wallets. It’s even possible that the sale of these HW-devices could be banned (there was a period a few years back when the import of HW-devices into the country was prohibited, and it was impossible to purchase them from the official manufacturer with delivery).
Or, conversely, it might boost illegal sales (possibly involving counterfeit devices with implants). In any case, a "time of change" is a prime opportunity to make money. The question is, who will do it?