Is there legislation for international online retailing?

Question

Law in IT

Actually, I am interested in the norms and legal acts, and other legal documents regulating trade between countries through online stores. It is also interesting how this process takes place from a legal point of view.
I'll give you an example. Everyone writes on Ali, if something is wrong with the product that you received, then you can send it back at your own expense and agree with the seller on compensation.
According to our Russian law, you send the goods back to the seller at your own expense only if they are of proper quality. If it is defective or they sent you something different from what you ordered, or some other jamb on the part of the seller, then the costs of return shipping are borne by the seller.
And so, when you order from other countries, it turns out that the seller messed up, and you pay for it with your money and time. This, I think, is extremely wrong.
In general, many who order on Ali describe a standard situation. You send the item back and that's it. No goods, no money in the end.
Just do not write in the answers about "well, you know about the risks." Or "by clicking the buy button you agree...". If what I agree with is contrary to the law, then it has no legal force. I also ask you not to write something like "but I sent the goods and then they returned the money to me and everything is ok." The same thing happens, but 50/50, and this is not a very good statistic.
I'm specifically interested in how it is fixed and works from a legal point of view. If someone knows specific laws, international agreements or other legal documents, please share.